The region of a sound wave where particles are tightly packed together

Depending on the organism the number of in a cell may change

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.

How does natural selection change thephenotypes within a population over time?