Answer: oxygen
Explanation: It is oxygen because we always need oxygen for many things and organisms
Answer:
d. Simple Carbohydrates
Explanation:
They contain "empty" calories meaning they have little nutritional value but still give you calories. It also is broken down relatively quickly because they are already very close in form to the simple sugars that enter your bloodstream.
If it's the same diagram as mine then it should be the control center of the cell