Mltochondria are the
of the cell.

powerhouse

Explanation:

The mitochondria are organelles located in the cell and play a crucial role in cell respiration where they produce ATP. ATP is basically the cell's energy source, so mitochondria is commonly known as the powerhouses of the cell because they produce this energy.

Hope this helps!

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.