Answer:
Mitochondria is the Powerhouse of the cell.
Explanation:
You use your muscles for basically everything you do. So, it wouldn't be more surprising if the muscles need more energy. You need them to have more energy or you wouldn't be able to do anything.
the right answer is by diffusion across a capillary wall
Answer:
The proton
Explanation:
The proton determines the identity of an element
Circulatory system involves the heart organ, its function is to pump blood around the body.
If this helped Plzz mark as brainliest plzz
