The first line of defense involves which structure(s)?

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

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.

Categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. makes predictions