Answer:
Homeostasis
Explanation:
Homeostasis means the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes. Meaning your body will regulate itself to keep its normal tempature.
I believe the answer is C
C) Green Plants
Label A is the amino group
Label B is the R group
Label C is the carboxyl group
A
B can be supported with surveying people,
C can be supported by inspecting Grass under a microscope