Idk what the "following stresses" are because there were no given options, but I would say a wildfire.
It would be letter D - A mutation occurs in one copy of the original gene.
Mutation is the changing of a structure of a gene that can be passed down to the next generations. It is the source of all evolution. As mutation progress through time, it leads to evolution.
Answer:
C.
It combines with hydrogen ions in sugar molecules to release energy and form water.
Explanation:
I think sorry if I'm wrong.