Question

select the part whose main job is to break down sugar and use. mitochondria smooth endoplasmic reticulum rough endoplasmic reticulum ribosome

Explanation:

Mitochondria are the power - houses of the cell. They carry out cellular respiration, which breaks down sugar (glucose) and converts its stored energy into ATP for the cell to use. The smooth endoplasmic reticulum is involved in lipid synthesis and detoxification. The rough endoplasmic reticulum is associated with protein synthesis due to the presence of ribosomes on its surface. Ribosomes are the sites of protein synthesis.

Answer:

mitochondria