The sum total of all the chemical changes that an organism performs to maintain its life and produce energy is the result of

The word we are looking for is metabolism. Metabolism is derived from the Greek word metabole, which means change. It can also be defined as the sum of all chemical reactions that transpire in living organisms, which includes digestion and the passage of substances into different cells.

The correct answer is:       [c]:   "organisms that are sensitive to changes in temperature would die. "