here's your answer.. Option (C): the sun
The answer is all of these occur. The tetrads need to be made before crossing over occurs, which only occurs in prophase 1. That automatically means it has to be all of the above.
Speciation, the evolutionary process by which new species are formed, is clearly responsible for the ultimate generation of species diversity over geologic time.
Because for each glucose molecule there are two pyruvic acid molecules entering the system, two ATP molecules are formed. Also during the Krebs cycle<span>, the two carbon atoms of acetyl-CoA are released, and each forms a carbon dioxide molecule.</span>
