When an organism breaks down organic molecules, some of the energy that had been stored as chemical energy is lost as heat. this happens because when an organism breaks down organic molecules, some of the energy that had been stored as chemical energy is lost as heat. this happens because every energy transfer or transformation increases entropy. the enzymes in photosynthesis are inefficient. the enzymes in cellular respiration are inefficient. chemical energy can only be converted to heat energy.\?

The right answer is: *some of the energy that had been stored as chemical energy is lost as heat.

Breaking down an organic molecule into smaller ones is part metabolism of all the living organisms. It is called catabolism.

Catabolism is the set of reactions of molecular degradation of the organism considered. It is the opposite of anabolism, all synthesis reactions. Catabolism and anabolism are the two components of metabolism.Catabolism reactions are oxidations (or dehydrogenations) and they are thermodynamically favorable, that is they are exergonic (yielding chemical energy, producing energy). A part of this energy is used for biological activities, like moving, building or binding molecules together. The other part is released as heat. (You can take an example in the real life like running, the energy lets you moving and produces by the way heat)

A. mitochondrion b. nucleus