All i need is number 4 please help me

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.

Development has provided electrically for less money but what may be considered a cause of nuclear power

What is the starting point in replication called