Cells need a source of energy, they get this energy by breaking down food molecules to release, the stored chemical energy.
Phylum chordata differs from other animal phyla because it contains a notochord , dorsal, hollow nerve cord, and a pharyngeal.
When a cell makes a protein the instructions are copied from part of the DNA strand and transcribed to new molecule, called RNA. RNA molecules carry the instruction from the nucleus to ribosomes.
Answer:
Your answer is A) Sedimentary. The rocks and pebbles you see on a daily basis are most likely limestone, which is an abundant sedimentary rock.
I’m pretty sure it’s hydrogen if I’m wrong I’m really sorry
