I think that for 1 it’s either A or B as the kidneys and everything get air and the lungs release it.
For 2 is probably D as the others don’t really make much sense.
The cell membrane is made up of a phospholipids that are arranged into two layers which are called lipid bilayer.
Answer:
a. adenine and guanine
Explanation:
A purines nucleotide is a combination of the heterocyclic aromatic rings, the imidazole and pyrimidine ring.
Answer:
A substance that undergoes a change during a reaction.
Explanation:
