I think is oxygen that what i think
<span>d)Electrons need specific amounts of energy to "jump" off an atom and be emitted.</span>
At the constant temperatures the lighter the gas molecules, the faster the average velocity of the gas molecules.
A nucleotide is composed of a phosphate group, sugar, and nitrogen base. DNA is made of 2 strands of nucleotides linked together by covalent bonds between the phosphate and sugar of each nucleotide. The strands of nucleotides are linked together by hydrogen bonds creating DNA. Hope this helps and sorry if I made a mistake.
