Produces ATP energy via cellular respiration (the powerhouse)

Mitochondria (singular: mitochondrion) convert chemical energy into energy that our cells can actually use. This process is called cellular respiration; the mitochondria use it to turn glucose and oxygen into energy called ATP.

Explanation:

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.