At sunrise and sunset, the sun is lowest in the sky, so it creates longer shadows. The shadows are the longest at these times than other times.
First part. Sorry if it is hard to read.
Viruses did not evolve first, they found. Instead, viruses and bacteria both descended from an ancient cellular life form.
It depends on how it changes cause if it changes shape then the substrate might not be able to come to the active site inorder for the enzyme to work correctly.