Cellular Respiration is the making of energy in the mitochondria. Photosynthesis is the production of oxygen in the chloroplasts. Their reactants are the products of each other.
A. Evolution is a scientific theory, and scientific theories have many hypothesis and experiments that support their findings.
Sexual gratification is the act of pleasing or satisfying one's sexual urges or others'. One of its kind is sexual sadism which is a sensual and sexual gratification derived from inflicting pain on a victim or seeing their victim suffer. It is a paraphilic coercive disorder wherein it inflicts continuous harm upon its victim even without the latter's compliance which sometimes lead not only to his/her eventual death but also defacement of his/her body.
