An ectotherm is an animal that is dependent on external sources of body heat
An endotherm uses heat that its body produces
So the best likely answer would be C.<span> whether or not the animal maintains a constant body temperature</span>
The answer is lipids.
<span>The macromolecules with the highest number of carbon-hydrogen (C-H) bonds are the lipids. The one of the main functions of the lipids is energy storage, therefore, they contain many C-H bonds which contain potential energy. Although carbohydrates can also store energy, they contain much oxygen .
So, he will need mostly black and red balls for a model of lipids.</span>
