A representation of the linkage between food chains in a community

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.

Isolated volcanic peaks on the ocean floor are

What are positive impacts of algae? how is it used?