Which resource is the main source of energy in the united states?

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

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.