The correct answer is (d.) proteins. Higher organisms use nitrogen to make their protein. Food that is containing protein also involves nitrogen in it. Protein also has amino acids that contain nitrogen in it which is a necessary essential nutrient for the body.
We have food water and air. We also have shelter.
Food,Water,Shelter,Air is the answer.
<span>Long tail for swimming
<span>Head for getting into the female cell
Hope this helps you ! :') </span></span>
The answer is studying for a test because you want to feel proud of your performance. Intrinsic motivation means you do something for the sake of your internal feelings/motivation, not based on something or someone external like a paycheck or significant other.
Proteins function as builders and give energy repair and reproduce muscle etc ...
