Select the part whose main job is to break down sugar to release energy that a plant cell can use.

Mitochondria

Explanation:it breaks down the glucose and release energy in the form of ATP adenosine tri phosphate

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.

protistas excret ethanol used in the manufacture of vinegar