Answer:
only 30% of total energy will be useful ..
So, Useful energy =

13.5J energy is useful
I think one is carbon dioxide not sure what the other is
Anatomical structure, possible diet, and reproduction evidence.
number 8 is b because when you eat plants or animals, it get transfred to glucose which is then transfered to atp. Think about it this way, when you are sick, you dont just go outside in the sun to recharge and then you suddenly get better, and energy, you have to rest and eat certain foods that will restore your ATP levles.
Answer:
The harvesting of energy from ATP to do cellular work
Explanation: