Which macromolecule is the main source of energy for living things?

The answer is: Adenosine triphosphate (ATP).

Explanation:

Adenosine triphosphate (ATP) is considered by biologists as the energy currency for life. It is a high energy molecule that stores the energy we need to do almost everything we do.

The answer is: Adenosine triphosphate (ATP).

structure is maintained and sustained by:

-cytoskeleton: gives cells coherence

-cell wall: support

-cytoplasm: shape

hope this .

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.