What do you think the term genetic variation means? how does genetic variation a species survive?

It means when there is a mutation in your DNA this can help you because it can help you get resistance. For example: virus's have a resistance to antibiotics because they had a genetic mutation.

Plato

Genetic variation means that a specific gene has various alleles. So, genetic variation results in multiple combinations of that specific gene among members of a species. Genetic variation makes it possible for a species to exhibit various traits related to that specific gene. Having a variety of traits can help species adapt to different environmental conditions over time.

Well, although an ADP is "phosphorylated" to add the inorganic phosphate (PO4) that makes it ATP, the process that provides all of the energy comes from C) the breakdown of food molecules.
In order to make 36-38 ATP per single glucose molecule, food must be catabolized (broken down) into its basic components (mainly glucose), then the energy released from C--C covalent bonds in glucose gets captured from electron carriers (NADH, FADH2) to transfer that energy into phosphorylating ADP into ATP.