Tiktaalik, an extinct fish species, could have existed in a Canadian environment due to the presence of shallow freshwater environments with low oxygen levels, which would have been suitable for its lung-like structure and ability to breathe air.
What is Tiktaalik?Tiktaalik is an extinct genus of fish that lived about 385 million years ago during the Late Devonian period. It is considered a transitional fossil, as it has characteristics of both fish and early tetrapods, four-legged land-dwelling animals. Tiktaalik could have existed in a Canadian environment, as it is known to have been found in the Canadian Arctic, specifically in the Elpistostege watsoni fossil beds of the Nunavut territory.
The environment during Late Devonian period in this region was a shallow freshwater delta or coastal plain that was home to a diverse array of fish and other aquatic organisms. Tiktaalik likely lived in the shallow water, and had adaptations such as flexible neck and fins with bones that resemble the limb bones of four-legged animals, which would have allowed it to move in shallow water and on land.
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In an investigation, individual Rhabdostyla were placed into different concentrations of sea water.
The rate of water excreted by the contractile vacuðle of each organism was determined. The results
are shown in Fig. 4.2.
20
18-
16
[3]
14
12
rate of
water
excreted
um's
10
8-
6
4-
2
0
0
4
12
Explain the result
Answer:
placed into different concentrations of sea water.
The rate of water excreted by the contractile
Which number represents runoff on the hydrologic cycle diagram?
1
2
3
4
Answer
No. 4
Explanation:
what is the neural control of the Musculoskeletal system
Answer:
Explanation:
The central nervous system controls these movements through the spinal motor neurons which serve as the final common pathaway to the muscles
When nutrients leave the digestive system and move to the circulatory system it is called...
Adjunction
Villi
Absorption
epithelial
Where does wind come from? Why and how is wind stronger than other times? Or why and how is wind lighter ( not as strong) as other times.
Answer:
Wind is air in motion. It is produced by the uneven heating of the earth's surface by the sun. Since the earth's surface is made of various land and water formations, it absorbs the sun's radiation unevenly. Two factors are necessary to specify wind: speed and direction.
Strong winds are due to a strong pressure gradient force. A pressure gradient is how fast pressure changes over distance. So, when pressure changes rapidly over a small distance, the pressure gradient force is large. Strong winds almost always result from large pressure gradients.
Explanation:
the surface area to volume ratio determines the rate of transfer across the cell membrane.
what has the best transfer rate?
A: Smaller cells with a high surface area to volume ratio have the best transfer rates
B: Medium sized cells are the best for transfer rates
Answer:the answer is a
Explanation: I just answered it
Smaller cells with a high surface area to volume ratio have the best transfer rates, hence option A is correct.
What is cell membrane?All cells have a cell membrane, also known as a plasma membrane, which separates the interior of the cell from the external environment. A semipermeable lipid bilayer makes up the cell membrane.
The movement of materials into and out of the cell is controlled by the cell membrane.
A small volume is better in terms of efficiency of transporting molecules throughout the cell, but a large surface area is better for transporting molecules across the cell membrane.
A surface area to volume ratio regulates cell size because as cells become larger, they have less surface area relative to their size.
Therefore, smaller cells with a high surface area to volume ratio have the best transfer rates, hence option A is correct.
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which of the following phenomena never affects the moons phase?
Answer:
A lunar eclipse never occurs during a full moon.
Explanation:
A lunar eclipse occurs during all full moons. A lunar eclipse can only occur during a full moon.
Look at the DNA strand below and its
complementary strand underneath it.
What type of mutation has occurred in
the complementary strand?
ATCGGACT
TACCTAG
A. insertion
B. deletion
C. no mutation has occurred
Answer:
B. Deletion
Explaination:
Answer:
B. deletion
Explanation:
You have been infected with the H1N1 flu virus. Describe how the virus might have entered your body, how it works to make you sick, and what happens when you finally get better. Lost at least 7 different steps
Answer:
Some symptoms like Cough , Fever , Headache, Chills,Body aches , Fatigue etc can be seen while suffering from this virus.deoxigenated blood returns to the heart via the vena cava. where does the blood go from the vena cava
a. left ventricle
b. left atrium
c. right ventricle
d. right atrium
Answer:
D
Explanation:
What conditions are needed do an accurate radiometric date to be obtained form a mineral sample?
Answer:
There are several conditions that are needed for an accurate radiometric date to be obtained from a mineral sample. These include:
The mineral must be a suitable type for radiometric dating. Some minerals are more suitable for radiometric dating than others due to their chemical composition and the type of radioactive isotope they contain.
The mineral must be in a closed system. This means that the mineral must not have exchanged any atoms with its surroundings since it formed. If atoms have entered or exited the mineral, it will not give an accurate radiometric date.
The mineral must be pure. If the mineral sample contains contaminants or impurities, it will not give an accurate radiometric date.
The mineral must be free of any damage or alteration. If the mineral has been damaged or altered in any way, it will not give an accurate radiometric date.
The mineral must be properly prepared and analyzed. The sample must be carefully prepared and analyzed using specialized equipment and techniques to ensure accuracy.
Overall, to obtain an accurate radiometric date from a mineral sample, it is important to ensure that the mineral is a suitable type, is in a closed system, is pure, is free of any damage or alteration, and is properly prepared and analyzed.
Explanation:
Why will individuals have brown eyes rather than a blue eyes?Question 6 options:a)
Brown eyes is a mutation.
b)
Blue eyes is recessive.
c)
Blue eyes is dominant.
Answer:People with brown eyes have a large amount of melanin in the iris, ... leading to blue eyes instead of brown in people with a polymorphism in ... result from mutations in genes involved in the production and storage of melanin. ... Heterochromia can be caused by genetic changes or by a problem during eye
Explanation:
I AM SORRY IF AM WRONG
Decomposers are very important because
A. They recycle energy
B. They recycle matter
C. They destroy what we don’t need
is there an impact on the environment if blue whales went extinct? Who or what would it impact?
Without whales, krill would probably consume a large portion of the free-floating phytoplankton on the ocean's surface, accelerating climate change noticeably.
What makes the blue whale significant in terms of the environment?
Although blue whales have a huge food need, the ocean environment benefits from them rather than being burdened by them. Their iron-rich excrement is a crucial supply of nutrients for the marine food web, boosting production in the Southern Ocean and increasing fisheries yields.
What impact does blue whale extinction have on biodiversity?
The food source for many animals in the marine ecosystem is the carcasses of whales. The disappearance of whales would deprive other marine species of nutrients, which will have an impact on all species in the ocean.
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Which of the following factors of a gene determines the protein, and therefore the trait, it expresses in a cell
Where the cell is found in the organism.
The position inside of the nucleus.
Its length and sequence of nitrogen bases.
Its shape and color after cell reproduction.
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Answer:
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Explanation: yeah i need points thx a lot g
explain how the huge reduction of a Tasmanian devil population since 1996 affects the accessibility of the current population to new diseases in comparison with accessibility of population before 1996?
Answer:
In the past two decades, this species has experienced severe population decline due to the emergence of devil facial tumor disease (DFTD), a transmissible cancer. During these 20 years, scientists have puzzled over the immunological and evolutionary responses by the Tasmanian devil to this transmissible cancer
If you weigh 60 pounds on earth, you would weigh blank pounds on the moon
Give organism a name. Give it a common name AND a scientific name.
Write a short description to describe your organism’s evolution and showcase its key traits.
Answer:
My organism is called the Red Panda (Ailurus fulgens). It is a mammal native to the eastern Himalayas and southwestern China. The Red Panda is the only living species of its genus, Ailurus, and is closely related to the Giant Panda, although it has a much more specialized diet. It is an excellent climber and has a thick, woolly coat to help keep it warm in its cold mountain habitat.
The Red Panda has evolved over time to become more specialized in its diet and habitat. Its thick fur helps to keep it warm in the cold mountain environment, while its long, bushy tail helps it balance while climbing trees. Its diet consists mainly of bamboo, but it also eats fruits, eggs, and small animals. Its sharp claws and teeth help it to break open bamboo stalks and to defend itself against predators.
Explanation:
Which of the following is a characteristic of renewable sources of energy
They are exhaustible
They cause air pollution
They will run out soon
They cause less pollution
Pls help ty
They cause less pollution. Renewable sources of energy, such as solar, wind, and hydroelectric, cause significantly less air and water pollution than non-renewable sources, such as coal and oil.
What is pollution?Pollution is the presence of toxic substances in the environment that can have a negative effect on humans, animals, and plants. It can either be the result of natural processes or due to man-made activities. Pollution can occur in the air, water, soil, and even in the food we consume. Common forms of pollution include air pollution, water pollution, plastic pollution, and noise pollution. Air pollution is the release of pollutants into the air which can cause harm to humans and the environment. Water pollution is the contamination of surface or ground water and can be caused by agricultural runoff, industrial pollution, and sewage. Plastic pollution is the accumulation of plastic particles in the environment that can damage ecosystems.
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Folate is a crucial vitamin for proper development of
the neural tube, which eventually becomes the brain and
spinal cord. Which of the following might explain why
neural tube defects occur more frequently than other
types of birth defects?
The neural tube, which is responsible for the development of the brain and spine, closes within the first 28 days of pregnancy.
Folate deficiency can prevent the neural tube from closing, which can result in a neural tube defect.
Which vitamin deficiency results in defects of the neural tube?Neural tube defects may be more likely in people with low vitamin B12 levels, according to the National Institutes of Health (NIH).
How does folate affect the developing uterus?The amount of folate in your blood is important to help prevent a neural tube defect, also known as a serious birth defect of the brain or spine, in a developing baby if you are pregnant or could become pregnant.
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After classical conditioning has occurred, if the conditioned stimulus (tone) is repeatedly presented alone, without the unconditioned stimulus (food), the conditioned response (salivation) will
Group of answer choices
generalize.
discriminate.
strengthen.
weaken.
Answer:generalize
Explanation:
After classical conditioning has occurred, if the conditioned stimulus is repeatedly presented alone, without the unconditioned stimulus, the conditioned response will WEAKEN.
Classical conditioning refers to a class of learning that occurs unconsciously.Moreover, conditioned stimuli are previously neutral responses that drive conditioned responses after their association with unconditioned stimuli.Extinction refers to the process in which a conditioned stimulus is applied repeatedly, but without being paired with its corresponding unconditioned stimulus.In conclusion, after classical conditioning has occurred, if the conditioned stimulus is repeatedly presented alone, without the unconditioned stimulus, the conditioned response will WEAKEN.
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Question 12
_______receive messages from other neurons and_____send messages to other
neurons.
O Dendrites; axons
O Axons; soma
O Soma; glial cells
Axons; dendrites
Answer:
dendrites, axons
Explanation:
Dendrites receive messages from other neurons and axons send messages to other.
The life activity known as synthesis is chiefly characterized by the:
A) Distribution of essential compounds throughout an organism.
B) Production of complex molecules from simpler ones.
C) Elimination of waste products from the organism.
D) Regulation of physiological activities.
Answer:
B) Production of complex molecules from simpler ones.
Explanation:
Synthesis is the process of combining simpler molecules to form more complex ones. This can occur through various chemical reactions within an organism. The other choices do not accurately describe the process of synthesis.
A) Distribution of essential compounds throughout an organism - This refers to the transport of essential molecules within an organism, rather than the production of complex molecules from simpler ones.
C) Elimination of waste products from the organism - This refers to the removal of waste products, rather than the production of complex molecules.
D) Regulation of physiological activities - This refers to the control of physiological processes, rather than the production of complex molecules.
what is meant by photosynthesis?
Answer:
The process in which green plants use sunlight to synthesize nutrients from carbon dioxide and water.
Explanation:
Which aquatic biome is heavily influenced by stratification?
1. rivers and streams
2. lakes and ponds
3. the ocean
Answer:
freshwater biomes
In freshwater biomes, stratification, a major abiotic factor, is related to the energy aspects of light. Marine systems are influenced by the physical water movements, such as currents and tides, along with the thermal properties of water.
hope it helps
Matching - select the best answer and place it next to questions below.
•Meristematic Tissue
•Permanent Tissue
•Genus, Species
•Chlorophyll
•Lenticel
•Node
•Monocot
•Dicot
•Simple Fruit
•Aggregate Fruit
•Root Hair
•Dormancy
•Totipotency
Hesperidium
Perfect Flower
Protoplasm
Pepo
Parthenocarpy
Leaf Vein
Adaptation
.
22.
Allows for plant survival in various climates
23.
Process where a plant produces a seed without fertilization
24.
Found in the bark of woody trees; allows for gas exchange
25..
Has male and female structures on one flower
26.
Found at the root tip; cell division still occurs here
27.
Extension of an epidermal cell
28.
Must be present for photosynthesis to occur
29.
Makes up the scientific name of a plant
30.
Includes the phloem and xylem
31.
Found in stems, leaves, flowers; cell division does not occur
32.
Derived from one ovary of a single flower
33.
Has a taproot system
34.
Time when the seed is not growing; period of rest
35.
Location on the stem where growth occurs
36.
Fleshy fruit that consists of a leathery rind
37.
Fleshy fruit that contains fragrant oil and leathery skins
38.
Derived from several ovaries of a single flower
39.
Cell characteristic that allows them to become any type of cell
40.
Living parts of a cell
Answer:
Hair root is 27 dicot is 33
Under normal cellular conditions, the FoF1 complex of the inner mitochondrial membrane functions to create new ATP. Under non-physiologic experimental conditions, isolated FoF1 complex can be driven in reverse as long as [ATP] is high. Which of the following would be true under such conditions?
A. The FoF1 complex would be operating as an ATPase rather than an ATP synthase.
B. The FoF1 complex would be driving net H+ movement from the matrix side to the IMS (intermembrane space) side
C. The FoF1 complex would create more ATP, per unit time, than it does under physiological conditions
D. As the experiment continues, we would expect to see higher & higher concentrations of ADP.
E. The FoF1 complex would effectively be operating as a proton pump.
Answer:
The answer is "Option A, B, and E".
Explanation:
In specific cell conditions, the F0F1 system of the inner mitochondrial membrane functions as an ATP synthase for generating new ATP ADP proteins and Pi. Even so, this has a specific biological role in non-physiological situations through functioning as an ATPase. Its ATPase acts in such circumstances and transmits large amounts of ATP to both the mitochondrial space throughout the transmembrane proton gradient.
The free radical of the transmembrane can be used by fermenting bacteria without an electron transport system. Its ATPase is being used to generate a proton gradient rather than to hydrolyze ATP. It may be used as a means of transporting flagella or nutrients into its cell.
The statements which are true about the FoF1 complex are:
The FoF1 complex would be operating as an ATPase rather than an ATP synthase.The FoF1 complex would be driving net H+ movement from the matrix side to the IMS (intermembrane space). The FoF1 complex would effectively be operating as a proton pump.So, the correct options are A, B, and E.
What do you mean by FoF1 complex?This complex is present in bacterial and mitochondrial H(+)-ATP synthases both consist of a membranous sector, Fo, which forms an H(+)-channel, and an extramembranous sector, F1, which is responsible for catalysis.
This FoF1 complex is the site of ATP synthesis along with the movement of protons (H+) from the matrix to the IMS. It is effectively operating as a proton pump because it mediates the transport of H+ ions out of the matrix.
Therefore, statements A, B, and E are correct with respect to the FoF1 complex.
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This is an example of a squirrel population
An example of a squirrel population would be a group of Eastern Gray Squirrels (Sciurus carolinensis) living in a city park.
What is an examples of squirrel population?An example of a squirrel population would be a group of Eastern Gray Squirrels (Sciurus carolinensis) living in a city park. Scientists may study the population dynamics and ecology of this group of squirrels by conducting surveys and capturing and marking individual squirrels to track them over time. This can provide information on their survival rates, reproduction, and movements, which can be used to estimate the size and growth rate of the population, as well as identify any factors that may be impacting the population, such as disease, predation, or habitat loss.
Additionally, scientists may also conduct transects, or study the population density, distribution of the squirrels in a specific area and the food resources that are available to them, as well as monitor the environmental factors that might affect the population growth.
Another example could be a population of Fox Squirrels (Sciurus niger) living in a rural forest. Here, researchers may study the impacts of logging and fragmentation on their population dynamics and genetic diversity, and understand how these animals are utilizing different food resources throughout the year.
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Increased biodiversity results in a more sustainable ecosystem because -
Answer: Because, the higher biodiversity in an ecosystem means that there is a greater variety of genes and species in that ecosystem, and stability. It makes an ecosystem more sustainable because of the food web being stronger and the organisms providing a wide variety of functions.
I hope I answered you correctly and that it helps, I'm sorry if its wrong. Good Luck!
Explanation: