A squirrel runs up a tree to escape a dog. Which process gives the squirrel most of the energy it needs to escape?
The correct answer is cellular respiration.
Cellular respiration is a biochemical process in which substrate such as glucose is oxidized to release energy in form of ATP, carbon dioxide and water. Most of the energy for the organisms to do all the life processes released by cellular respiration. Cellular respiration may be occur in presence of oxygen called aerobic respiration or in absence of oxygen anaerobic respiration.