If a response encourages the original stimulus, the system is a feedback system. a Negative
b. stable
C. positive
d. Deficient

Structures in cells that carry out specific functions.

What do all macromolecules have in common with each other? oa. they all are formed from the same elements.ob. they all have major roles in cell membranesoc. they all act as catalysts in the body.od. they all have peptide bonds between carbon atoms.

Plz ! ive been stuck on this forever