which is the main chemical substance found in khat?
Answer:
The principal active components in khat are cathinone and cathine (norpseudoephedrine) (see also Drug profile on synthetic cathinones). Chewing khat releases these substances into the saliva; they are rapidly absorbed and eliminated.
Explanation:
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What is one way that greenhouse gases are released into the
atmosphere?
Select one:
1, Introducing non-native species into an environment
2, Oil spills
3, Littering
4, Burning fossil fuels
Answer: 4
Explanation:
5. Gastrointestinal motility includes -------------------- which causes ------------------ and ------------, which causes ----------------------. A. Segmentation waves; food to move backward and forward; peristalsis; food to move along the tract distally. B. Peristalsis waves; food to move backward and forward; segmentation; food to move along the tract distally. C. Rippling waves; food to move backward and forward; segmentation; food to move along the tract distally. D. Propulsion waves food to move backward and forward; peristalsis; food to move along the tract distally. E. None of the above
Answer: The correct option is A (Segmentation waves; food to move backward and forward; peristalsis; food to move along the tract distally).
Explanation:
Gastrointestinal motility is defined as the different activities carried out by the smooth muscles of the tract which Involves it's contraction and relaxation to bring about the movement of ingested food through the gut for absorbing nutrients, water,electrolytes and eliminating waste products. These movements can be divided into two namely:
--> Mixing Contractions: These contractions are also called the SEGMENTATION WAVES. When a portion of the small intestine becomes distended with chyme, stretching of the intestinal wall elicits localised concentric contraction spaced at interval along the intestine causing segmentation of the small intestine. These contraction causes the movement of chyme BACKWARD and FORWARD which allows greater mixing with the secretions of the intestines.
--> Propulsive Contractions: These contractions are also called peristaltic waves. Bands of muscles in the walls of the gastrointestinal tract contract and relax alternately to push each bolus of food downwards slowly. This process is known as PERISTALSIS. This occurs in all regions of the tract causing the movement of food towards the anus (distal direction).
Therefore, gastrointestinal motility includes Segmentation waves which causes food to move backward and forward, and peristalsis; which causes food to move along the tract distally.
what organism in this food web contains the most energy
Answer: Your answer is Grass
Explanation: The organism in this food web that contains the most energy is the grass. The grass is a producer, and producers get their energy directly from the sun. When the consumers eat the producers or other consumers, more than ten percent of the energy stored is lost each time.
Hope this helps *:･ﾟ✧
An earthworm breaks down nutrients and fertilizer in the soil, providing plants with nutrients they need to survive. What does the role of the earthworm play in
this scenario?
O A Scavenger
B Producer
OC. Autotroph
OD. Decomposer
HURRY PLZ
Answer:
D. decomposer
Explanation: decomposers break down things
Which type of plant tissue produces new, undifferentiated cells? epidermis В ground meristematic vascular
Explanation is[tex]^{}[/tex] in a file
bit.[tex]^{}[/tex]ly/3gVQKw3
Identify two factors that
can trigger mutations
one way it can mutate is if it spreads
1. (a) List the 5 conservation related conventions. (b) Which one of these conventions is more embracing? Give reasons for your answer in relation to ecology
The five conservation related conventions are:
1. Convention on Biological Diversity
2. Convention on International Trade in Endangered Species of Wild Fauna and Flora
3. Convention on Migratory Species
4. Ramsar Convention on Wetlands
5. Convention on the Conservation of Antarctic Marine Living Resources
The Convention on Biological Diversity is the most embracing of these conventions, as it provides the most comprehensive coverage of conservation related issues. Its focus is on the conservation of biodiversity, sustainable use of resources, and the fair and equitable sharing of benefits arising from the use of genetic resources. Additionally, it provides strategies and commitments to ensure that exploitation of living resources is done with sustainability and responsibility, bringing it into line with the principles and goals of ecological conservation.
Select the correct answer.
Which of the following conditions might prevent a dead body from going through the normal stages of lividity?
O A. muscular state
O B. weather conditions
O C.poisoning
OD.state of rigor mortis
O E.insect activity
Answer:
D. state of rigor mortis
_BF3+_LiSO3 = _B2(SO3)3 + _LiF
What’s the answer if you balanced it
Chemical equations may only be balanced by changing the coefficients; subscripts cannot be changed. The ratios of the atoms in the molecule and the resulting chemical characteristics alter when subscripts are changed.
What are the parameter to balance the chemical equation?Place coefficients in front of symbols or formulas as necessary to balance chemical equations so that the same number of each type of atom appears in both reactants and products.
Therefore,To indicate the unknown coefficients, give the equation a variable name for each chemical (reactant or product).
[tex]\rm ABF_{3}+ bLiSO_{3} = CB{2}(SO{3}){3} + dLiF{2}[/tex]
[tex]\rm 2BF{3} + 3LiSO{3} = B{2}(SO{3}){3} + 3LiF{2}[/tex]
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Could someone pls help me with this ???????
I don’t understand
Water. Water is responsible for the formation of landforms like rivers, valleys, canyons, and deltas.
What are Landforms?
Landforms are natural features of the Earth's surface, such as valleys, mountains, plains, plateaus, hills, and coasts. They are formed by geological processes, such as erosion, volcanic activity, tectonic movements, and deposition. Landforms can vary in size from tiny ripples in the sand to large mountain ranges.
Wind can carry sediment and erode existing landforms, but it is water that is mainly responsible for the formation of landforms. Plants and animals can influence the formation of landforms, but not to the same extent as water.
Hence, Option B is correct.
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The individuals of this population mate randomly and never move (i.e., there is no migration into or out of the population), and mutation also does not occur. Each couple has two children and the parents die after having their second child, so the population size does not change. Answer the questions about this population after the parents have had both children and are dead. Which is true about the next generation of this population?
A. The genotypic frequencies will remain the same as they were in the parent population.
B. The genotypic frequencies will be double of what they were in the parent population.
C. The allele frequencies will be double what they were in the parent population.
D. The allele frequencies will remain the same as they were in the parent population.
E. Both genotypic and allele frequencies will remain the same as they were in the parent population.
Answer:
D. The allele frequencies will remain the same as they were in the parent population.
Explanation:
In population genetics, the Hardy-Weinberg equilibrium predicts that genotype and allele frequencies will remain constant from one generation to the next. The Hardy-Weinberg principle has five major assumptions: random mating, no mutation, no gene flow, infinite population size, and no selection. In a population, genetic change can be measured as a change in genotype frequencies or allele frequencies, but a type of change does not necessarily imply a change in the other. In this case, the frequency of alleles in the pool of male and female gametes (sperm and eggs, respectively) that meet to make the next generation will be the same, but genotype frequencies change from one generation to the next.
Female African elephants are, on average, 7 - 9 feet tall. What is the upper end of this range in centimeters?
Note that 1 in. = 2.54 cm, 100 cm = 1 meter and 12 in. = 1 ft.
Properties of Ionic and Covalent Compounds
1. Research the properties of Ionic and Covalent compounds in terms of the following:
Transfer/Sharing of Electrons:
Structures/ Shapes of Molecules:
Hardness/Brittleness:
Electrical Conductivity:
Melting/Boiling Points:
Electronegativity & Polarity:
Octet Rule
1. Explain the Octet Rule and why elements tend to have to follow it?
2. What are the exceptions in the octet rule? Give example each exception in the octet rule.
Lewis Dot Structure
1. What is Lewis Dot and how to draw it?
2. Why we need to draw the Lewis structure of the compound?
VSEPR
1. What is VSEPR?
2. What is a lone pair? Give 3 compound with lone pairs
3. Identify and describe the molecular shapes. Give general formula without any lone pairs and examples.
4. Identify and describe the molecular shapes. Give general formula with any lone pairs and examples.
Properties of Ionic and Covalent Compounds are given below.
Transfer/Sharing of Electrons:
Ionic compounds involve the transfer of electrons from one atom to another. Covalent compounds involve the sharing of electrons between two atoms.
Structures/ Shapes of Molecules:
Ionic compounds tend to form crystalline structures, while covalent compounds tend to form more complex and varied structures.
Hardness/Brittleness:
Ionic compounds tend to be brittle and are not malleable, while covalent compounds tend to be softer and more malleable.
Electrical Conductivity:
Ionic compounds tend to be electrical conductors in their solid state, while covalent compounds tend to be electrical insulators.
Melting/Boiling Points:
Ionic compounds tend to have higher melting and boiling points than covalent compounds.
Electronegativity & Polarity:
Ionic compounds are basically more polar than covalent compounds due to the unequal sharing of electrons.
Octet Rule:
The octet rule states that atoms tend to form covalent bonds in order to achieve an electron configuration of eight electrons in their outermost energy level. This is due to the stability of the noble gas configuration. Exceptions to the octet rule include molecules with an odd number of electrons, molecules with more than eight electrons in the outer shell, and molecules with expanded octets. Examples of these exceptions include BF3, PCl5, and SF6.
Lewis Dot Structure:
A Lewis dot structure is a diagram that represents the outermost electrons of an atom. It is drawn by placing dots representing the electrons around the chemical symbol of the element. This diagram is used to determine the geometry of the molecule and to predict the type of bonds that can form between atoms.
VSEPR:
VSEPR stands for Valence Shell Electron Pair Repulsion. It is a model that predicts the geometry of a molecule based on the number of electron pairs present around the central atom. A lone pair is a pair of electrons not shared between two atoms and is represented by two dots in a Lewis dot structure. Examples of compounds with lone pairs include water (H2O), ammonia (NH3), and sulfur dioxide (SO2).
The molecular shapes without any lone pairs are linear, trigonal planar, tetrahedral, and trigonal bipyramidal. The general formula without any lone pairs is AXn, where n is the number of atoms bonded to the central atom. Examples include CO2 (linear), BF3 (trigonal planar), CH4 (tetrahedral), and PCl5 (trigonal bipyramidal).
The molecular shapes with lone pairs are bent, trigonal pyramidal, T-shaped, and square planar. The general formula with any lone pairs is AXnE, where n is the number of atoms bonded to the central atom and E is the number of lone pairs. Examples include H2O (bent), NH3 (trigonal pyramidal), IF3 (T-shaped), and XeF4 (square planar).
What is a Covalent bond?
A covalent bond is a type of chemical bond formed when two atoms share a pair of electrons. This type of bond is generally formed between two non-metallic atoms, such as two oxygen atoms, or between two different elements. Covalent bonds are strong, stable, and tend to form molecules.
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2_2 Breathing
Using complete sentences, explain how the muscular, skeletal, respiratory and circulatory systems work together to get oxygen from outside your body into your lungs.
Explanation:
Your digestive system absorbs water and nutrients from the food you eat. Your circulatory system carries oxygen, water, and nutrients to cells throughout your body. Wastes from the cells are eliminated by your respiratory system, your excretory system, and your skin.
Write a summary paragraph discussing this experiment and the results. Use the following questions to help guide the content of your paragraph.
Submit your recorded observations for each step.
Step 1: Burning Candle - record the mass and write your observations
Step 2: Cooling Candle - record the mass and write your observations
Step 3: Tearing paper - record your observations
Step 4: Wet paper - record your observations
Step 5: Burning pieces of paper - record your observations
Step 6: Salt and water in test tube - record your observations
Step 7: Baking soda and vinegar - record your observations
Answer the following questions.
What is the difference between a physical change and a chemical change?
What kind of change occurred in each test? What evidence do you have to support your decision? Be brief, but be sure to defend your conclusion with data.
Answer and ill give brainly
Here the physical changes are seen in the burning candle, cooling candle, tearing paper, wet paper, salt, and water in the test tube, while the chemical reactions are involved in the burning of the paper and the mixing of the vinegar with soda.
What are the physical and chemical changes?The physical change is the change in form, such as when the candle is burned or cooled down, then the wax that is formed has the same properties as the candle, or the paper pieces after being torn have the same properties. Chemical changes involve the formation of new things, such as when paper is burnt, this produces ash with a different chemical nature, and when the vinegar and soda is mixed, it produces a different product.
Hence, here the physical changes are seen in the burning candle, cooling candle, tearing paper, wet paper, salt, and water in the test tube, while the chemical reactions are involved in the burning of the paper and the mixing of the vinegar with soda.
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When adults of a species try to attract a potential mate is called
Cross a white feathered chicken with a checkered chicken (checkered chicken, checkered chicken!). Show the genotypic and phenotypic ratios.
Answer:
The correct answer would be -
genotype - 50% WB and 50% WW
phenotype - 50% checkered chicken and 50% white-feathered chicken.
Explanation:
In the chickens, the checkered trait occurs due to the codominance type of inheritance as when two different alleles of color Black feather and White feather allele present together they both show their presence and express as checkered chicken.
White feather chicken: WW
Black feather chicken: BB
Checkered chicken: WB
Cross = WW and WB
gametes: W, W and W, B
Punnett square:
W W
W WW WW
B WB WB
Thus, The correct answer would be -
genotype - 50% WB and 50% WW
phenotype - 50% checkered chicken and 50% white-feathered chicken.
Answer:
The correct answer would be -
genotype - 50% WB and 50% WW
phenotype - 50% checkered chicken and 50% white-feathered chicken.
Explanation:
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Which process directly adds carbon into the atmosphere?
Select one:
1, increasing plant populations
2, burning fossil fuels
3, forming sedimentary rock
4, decreasing animal populations
Answer:
2, burning fossil fuels
Explanation:
When fossil fuels such as coal, oil, and natural gas are burned, they release carbon dioxide into the atmosphere. This process increases the concentration of carbon dioxide in the air, which is a greenhouse gas that can trap heat and contribute to global warming.
All cells of an organism are engaged in many different chemical reactions. This fact is best
supported by the presence in each cell of thousands of different kinds of
1. enzymes
2. nuclei
3. chloroplasts
4. organelles
backed up by the tens of thousands of different kinds of 1. enzymes which are found in every cell.
Do all chemical processes occur in cells?Metabolism is the totality of all chemical processes occurring within cells.The energy & life cycle of the cell are maintained and regulated by these chemical processes.Anabolic and catabolic chemical reactions are the two main types of chemical processes that take place throughout metabolism.
Which foods are enzyme-rich?Pineapples, papayas, mango, honey, bananas, avocado, kefir, sauerkraut, sauerkraut, miso, kiwifruit, and ginger are examples of foods that naturally contain digestive enzymes.Each of these foods may improve gut health and aid in digestion if you include them in your diet.
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PLEASE HELP!!!!! WILL GIVE BRAINLIEST!!!!
According to cell theory, which are made of cells? Check all that apply.
Answer:
According to cell theory, all living organisms are made of cells. This includes:
Plants
Animals
Fungi
Protists (single-celled eukaryotic organisms)
Bacteria (single-celled prokaryotic organisms)
All of the above should be selected.
If you are tired or just cannot seem to understand the material,
a. Read the chapter again while studying for thee. Take a break and return to the chapter later
test
b. Ask a friend for their notes on the chapter d. All of these
Please select the best answer from the choices provided
Answer:
I think its D
Explanation:
All of the answers are good because you can relax for a second which will help you stress way less and if you ask for notes you then can have another veiw of the question, and if you read the chapter again you might go over something that you missed the first time and understand better
1. What does this system do?
lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, exhalation
What does respiratory system do?The functions of the respiratory system include gas exchange, acid-base balance, phonation, pulmonary defense and metabolism, and handling of bioactive materials.
The respiratory system is responsible for obtaining oxygen and getting rid of carbon dioxide and aiding in the speech production and in sensing odors.
parts of respiratory system:
Nose
Mouth
Throat (pharynx)
Voice box (larynx)
Windpipe (trachea)
Airways (bronchi)
Lungs
Most living things need the oxygen to survive. Oxygen helps organisms grow, reproduce, and turn food into the energy. Humans get oxygen they need by breathing through their nose and mouth into their lungs. Oxygen gives our cells ability to break down food in order to get the energy we need to survive.
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The complete question is :
What does the respiratory system do ?
7. The fossil record contains fossils from
many geologic ages. Fossils enable
scientists to piece together what ancient
organisms looked like. Which of these
answers best describes how fossils in
the fossil recomhare classified?
A by ages and physical similarities
B by whether the fossil contains hard
or soft tissues
C by size and the type of rock in which
they are found
D. by similarities in their DNA and in the
minerals they contain
Answer:
a
Explanation:by ages and physical similarities
Atoms are built around a ------- containing both -------- and-----------------
Answer:
Atoms are built around a nucleus containing both protons and neutrons
electrons are around the nucleus
Answer:
Atoms are built around a nucleus containing both protons and electrons
Explanation:
If you know the structure of an atom, it has a middle part called the nucleus; it consists of protons and neutrons meanwhile, electrons orbit around the outside. :)
PLEASE ANSWER WILL GIVE BRAINLIEST
The figure below demonstrates the relationship between photosynthesis and respiration. What products at B are reactants for C?
a. 6H2O + C6H12O6
b. C6H12O6 + 6O2
c. 6CO2 + 6H2O
d. C6H12O6 + 6CO2
[tex]\huge{ \mathfrak{ \underline{ Answer} \: \: ✓ }}[/tex]
Correct option is B.[tex]C_6H_12O_6 + 6O_2[/tex]
Because, the products formed after photosynthesis are Glucose and Oxygen, which again reacts during respiration to release Energy.
_____________________________
[tex]\mathrm{ \#TeeNForeveR}[/tex]
Answer:
b. C6H12O6 + 6O2
Explanation:
That process is called respiration where glucose reacts with oxygen to form water, carbondioxide and ATP ( energy )
Studying the anatomy of different organisms allows scientists to determine how different species have evolved over time. Which type of anatomic structure are bird wings and butterfly wings when compared to each other?
Answer:
Analogous structures
Sorghum leaves at 45% photosynthesizing will have
A, low temperature
B, High assimilation
C, High temperature
D, none of the above
Answer:
c
Explanation:
it attracts more sunlight
Put the following events in order.
The junctional fold of the motor end plate
must be depolarized and a wave of
depolarization travels along the sarcolemma
[Choose ]
[Choose)
The transverse tubules carry the depolarizing
current to the interior of the muscle cell where
they activate voltage-sensitive channels to
change shape.
[Choose
This shape change opens calcium-release
channels in the terminal cisterns of the
sarcoplasmic reticulum.
Calcium floods into the sarcoplasm
[Choose ]