#3.) Which of the following is true about the carbon cycle? a
Combustion reduces carbon dioxide gas.
b
Respiration uses carbon dioxide gas.
с
Decomposition recycles the carbon compounds in nature and produces carbon dioxide.
d
Photosynthesis removes carbon dioxide from the atmosphere and makes organic matter.

The answer you’re looking for is
D.
- I hope this helps, I got it right. Enjoy the rest of your day/night, please make me brainliest!

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.