Why are mitochondria called the powerhouses of cell

Well, that's because they are know for making energy for the cell mitochondria are also found in both plant and animal cells they are small organelle that supply's energy to the rest of the plant or animal cell they produce molecules that are call ATP which helps provide the respiration that the cell needs to survive.

The answer is energy. the arrows are showing how exited and energized the stones are.

They are both used to view parts of the cell