Answer:
Assertion and reason are true and reason is the correct explanation of assertion
List the major organs of the central nervous system ninr tynes of nerves? only major
Answer:
brainspinal cordsensory organs#Make this answer as brainliest answer
delivers blood to the heart
Answer:
veins
Explanation:
Arteries carry blood away from the heart and veins carry blood back to the heart.
6. Cytokinesis is when the cell now divides into two new cells, each with a full set of
chromosomes.
ATrue
b. False
Answer: true
Explanation:
what is the definition of Concentration Gradient?
Did the total number of new products with health claims increase or decrease between 1990 and 2000?
I really need help thiss ILL MARK BRAINLIEST IF CORRECT
Research the fossil record of humans and answer these questions:
Name at least two extinct species that share a close evolutionary relationship with humans.
Explain the similarities and differences that exist between these species and humans.
Is the fossil record complete for humans? Explain your answer.
Answer:
A Gigantopithecus, Paranthropus, Adripcines, and an Orrorin.
The similarities they have with us are the face features, personality traits, and DNA. The differences is that they have way more body hair, communication, and mental abilities.
Explanation:
Hope this helps you :)
Chimpanzees and bonobos are the two species that closely related to humans.
The fossil record shows that the DNA of human and ape are closely related to each other which indicates that about 6 million years ago humans shared a common ancestor with the Great apes such as chimpanzees and bonobos.
Human DNA is similar to chimpanzee DNA about 98.6%. Both are also similar in physical makeup and intelligence. The main difference between human and chimpanzee is that the chimpanzee walks on four limbs and they can't swim whereas humans walk on two limbs and can swim so we can conclude that the chimpanzee and bonobos resembles to human to a great extent.
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what does social comparison theory propose?
That people have an innate drive to evaluate themselves, often in comparison to others.
Pls help me answer thank you
Answer:
b is the correct answer
Explanation:
hope it helps u..
the epicenter of an earthquake is
Which region of the brain controls your heart rate?
A. Medulla
B. Pons
C. Pituitary
D.Hypothalamus
Consider an experiment in which subjects are given a pill to test its effectiveness in reducing the duration of a cold. Which of the following is the best way to treat the control group.
A. Give the control group two pills instead of one.
B. Do nothing with the control group.
C. Give the control group a pill that looks like the test pill but does nothing
Answer:
c.
Explanation:
(comment if you need an explenation and I'll give it)
Give the control group a pill that looks like the test pill but does nothing is the best way to treat the control group. Option C is correct.
The best way to treat the control group in this experiment is option C: give the control group a placebo pill that looks like the test pill but does not contain any active ingredients. Here's why:
Ensuring Validity: A control group is used to establish a baseline for comparison. By giving the control group a placebo pill that looks identical to the test pill, researchers ensure that both groups experience the same psychological and physical conditions except for the presence of the active ingredient. This helps eliminate potential bias and confounding variables that could affect the results.
Blinding: Giving the control group a placebo maintains blinding, where participants do not know whether they are receiving the active treatment or the placebo. This prevents participants' expectations or beliefs from influencing the outcomes, enhancing the experiment's validity.
Placebo Effect: The placebo pill accounts for the placebo effect, a psychological phenomenon where participants experience improvements in their condition due to their belief in the treatment's effectiveness. By giving the control group a placebo, researchers can assess whether the test pill's effects are genuinely due to the active ingredient or influenced by participants' perceptions.
Ethical Considerations: It's important to provide some form of treatment to the control group to ensure they are not harmed or misled. Giving them a placebo pill with no therapeutic effect is an ethical way to include them in the study while minimizing potential risks.
Overall, using a placebo that mimics the appearance of the test pill ensures a controlled and rigorous experiment, where the effects of the active ingredient can be accurately evaluated. This approach maintains scientific integrity, valid comparisons, and ethical considerations.
To learn more about cold, here
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Seema left a slice of bread in her tiffin box after a few day she saw greenish white growth on it
A. What kind of organisms must have grown
B. How do such organisms obtain nutrition
C. What is the mode of nutrition know as
Answer:
a what kind of organisms must have grown
Explanation:
What process makes children different than their parents?
Answer:
So children look like combinations of their parents because they are. Each parent gives half of their genetic material to their children. The combination makes a unique combination of their parents genes. The scientific study of how traits are passed from parents to children is called 'genetics'.
Explanation:
Even where children's genes look identical to their parents, their bodies and minds could well differ, influenced by many other factors, including the portions of the parents' DNA that don't code for genes, their environment, and their behavior. I am the dark-haired, brown-eyed mother of two blond, blue-eyed children
what is the importance of food safety handling?
which of the following options provides evidence of how algal blooms harm ocean ecosystems
Answer:
Harmful algal blooms cause thick, green muck that impacts clear water, recreation, businesses and property values
Explanation:
hope it may help you
Enzymes and substrate fit together at the active site to form a lock and key mechansim. This means
a) if they don't fit, it is the wrong substrate or the enzyme is denatured.
b) substrates work on enzymes, allowing them be be denatured.
c) the shape and size of the enzymes does not matter.
d) enzymes are not specific and work on a variety of substrates.
Answer:
the answer is option b hope you understand
The lock and key mechanism of enzyme and substrate means that if they don't fit, it is the wrong substrate or the enzyme is denatured.
WHAT IS AN ENZYME?
An enzyme is a protein substance that regulates biochemical activities in living cells by acting as a catalyst. Enzymes act on substrates but they do not get changed during the process. This means that enzymes can be used over and over again. Enzymes are substrate-specific i.e. they act on specific substrates. The lock and key model explains the mechanism of action of enzymes. Enzymes attach to substrate at their active sites and act on them to form products.The lock and key model explains that if enzyme and substrate don't fit, it is either the wrong substrate or the enzyme is denatured.
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Write any three adaptional features of plants that grow in cold regions
Answer:
1. Cushion plants - these are compact, low growing plants. These characteristics help them to survive in cold and windy conditions. They trap airborne dust and use it as a source of nutrients.
2. Arctic poppy - this has a hairy stem to retain heat. The flower can track the sun in the sky to maximize the amount of sunlight it receives so that it can increase photosynthesis.
3. Cotton grass - this grass has small seeds that can easily be dispersed by the wind to ensure its survival. It is low lying to protect it from cold winds and has thin leaves to reduce water loss by transpiration. Cotton grass grows and produces seeds quickly as soon as the temperature increases.
4. Lichen - this organism does not need soil to grow. It grows very slowly, can withstand very cold temperatures and survives beneath snow.
Explanation:
Hope it helps.. if yes, plz mark me as brainliest
how do fish obtain oxygen?
a.
from water flowing over their gills.
b.
from water flowing over their fins.
c.
from water flowing over their lungs.
d.
none of the above.
Fish take water into their mouth, passing the gills just behind its head on each side.
Select the correct answer.
We use electrical devices that produce motion, light, and sound. Which aspect of energy explains why these devices are possible?
Answer:
electricity its energy and force
Human beings are responsible for the conservation of the environment. Justify
the statement.
Answer:
because of the following ways
Explanation:
1)because they protect plants
2)because they protect animals
3)because they are starting to use less vehicles
4)because they lessened the use of industrial vehicles
4 Which muscles are actively involved in normal breathing?
Answer:
The main muscles are the diaphragm and intercostal muscles, but the muscles in the neck and the abdominal muscles also help.
Explanation:
The diaphragm is the muscle under the lungs that helps move the lungs while the intercostal muscles are the muscles in between the ribs.
Hi!! can u help me? It's a very confusing question
Answer:
Well since they have the same environment and the only thing that is different is the amount of sunlight and final height of the plant, we can say that the more sunlight a plant gets, the more it grows.
identify the type of cell that specialised cells are formed from
Explanation:
Stem cells provide new cells for the body as it grows , and replace specialised cells that are damaged or lost.
Check all of the items that are cycled through the biosphere in biogeochemical cycle
Answer:
Biogeochemical cycles important to living organisms include the water, carbon, nitrogen, phosphorus, and sulfur cycles.
Explanation:
what does an observation use
Answer:
Observation is the active acquisition of information from a primary source. In living beings, observation employs the senses. In science, observation can also involve the perception and recording of data via the use of scientific instruments. The term may also refer to any data collected during the scientific activity
Compare the use of hormones as chemical messengers in plants and animals.
Both plants and animals use glands to produce and secrete hormones.
Many of a plant's hormones are secreted into the air, while many of an animal's hormones are secreted into the blood.
Many of a plant's hormones are secreted into intercellular fluid, while many of an animal's hormones are secreted into the blood.
Plants do not use hormones as chemical messengers, but animals do.
Many of a plant's hormones are secreted into intercellular fluid, while many of an animal's hormones are secreted into the blood.
Hormones are those substances which gives an organism the ability to respond to both internal and external stimuli which are necessary for their growth and maintenance.
Plant hormones are also known as plant growth substances which are produced in small amounts within the plant body (intercellular fluid).
They control growth and growth movements by accelerating or inhibiting cell division, elongation and differentiation.
Examples of plant hormones include auxins (produced at the apices of shoots) and gibberellins.
The animal hormones are secreted by endocrine glands directly into the blood stream. There are then transported to where ever they are needed.
Examples of animal hormones include:
ProlactinOxytocinAnti-diuretic hormone.Learn more here:
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Give two incidents of osmosis process
Answer:
Raisin In Water. If you put a raisin into pure water, it swells up over time. This happens because raisin contains a higher concentration of sugar and other solutes than water, so water moves into the raisin cells by osmosis. Since the solvent (pure water) enters into the raisin cell, this is an example of endosmosis.
Explanation:
Fill in the blanks
1. ..................... energy is used by plants to prepare their foods.
2. .............…. is the main source of energy for the earth.
Answer:
1.Sunlight.
2.The sun.
Hope it helps you .:-)Answer:
Solar energy/Radient energy is used by plants to prepare their foods.
Solar energy is the main source of energy for the earth.
Will the amount of time studying effect your grade in the class?What is the independent and dependent variable ?
Answer: Time= independent Grade= Dependent
Explanation: Time is independent and the grade is dependent on time.
8th std science light lesson important points
Answer:
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Answer:
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Explanation: