The mass is made up of protons and neutrons, the valence electrons only determine stability, not mass
Answer:
Eventually the IR photons escape into space, but some make several round trips between the ground and the atmosphere before they depart. Along the way, a lot of energy is transferred to the ground and the atmosphere. That energy becomes heat which warms Earth's surface and its atmosphere.
Adenine and guanine
Thymine and cytosine
I believe it is mRNA- messenger RNA
