An organism's niche includes the type of food it eats, how it obtains its food, and what its predators are. Here is a quizlet website that has more answers to questions like this one: https://quizlet.com/81207203/section-4-2-review-flash-cards/
Your answer is: Niche
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A<span> synapse is your answer. hope this helps you!</span>
Proteins are made of amino acids. In the cell, those amino acids are strung together as new proteins that your body can use to get reactions going. Carbohydrates also need to be balanced with fats and protein to maintaina healthy weight.
Basically, they control the rate of reactions and regulate cellular activity.
The answer is A, a vaccine. This is why they are often given to children for prevention.