Object English sorry
Have you ever kept a secret? How hard is it to keep a secret? Are there circumstances when you think you should break a promise about keeping a secret?

Hahaha good one. you ? & oop

We can use solar powered cars or ride bikes instead of cars that burn fossil fuels

It would be 232.4242

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.