Answer:
Plant and animal cells.
Explanation:
Found in every eukaryotic cell.
You didn't put any answer choices, but air and water are generally the greatest.
Amino acids are the building blocks of life
The answer in the space provided is anaerobic respiration.
It is because this allows of having to utilize other substance than oxygen such
as nitrate or sulfate to be their electron acceptors in which is for organisms
that undergoes respiration.
