Petrochemicals include many things, I would say All of the above. Hope this helped! :)
The <em><u>MESOSPHERE </u></em>is the coldest layer and the hottest layer is <u><em>THERMOSPHERE </em></u> is the hottest layer in the atmosphere.
Answer:( answer for number one) an essential nutrient for the production of amino acids, proteins, nucleic acids. ( number 2 ) for the growth, maintenance, and repair of all tissues and cells, and for the production of the genetic building blocks, DNA and RNA
Answer:
After the G2 phase
Explanation:
If you want more information on all the phases, leave a comment and I'll write another answer explaining the purposes of the other phases