Cell is one which performs a specific
function in the body.

"They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body's hereditary material and can make copies of themselves. Cells have many parts, each with a different function"

Explanation:

there is the link

https://ghr.nlm.nih.gov/primer/basics/cell

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /

it's c. (to reduce the greenhouse effect/carbon gasses)