Pretty sure it's all of the above
Black squirrels may increase in a certain area due to natural selection because of the ground below it being dark so the squirrels would adapt to the terrain, making them harder to see by predators.
EXAMPLE: if a light fur colored squirrel is on a dark terrain, an Owl or Large bird could easily see the color differentiation and notice that it is a small land organism (prey).
So the squirrels kin would evolve in the sense that they would have darker fur to match their inhabitance
Blank 1: Inner membrane of the Mitochondria
Blank 2: matrix of the mitochondria
Blank 3: their own nucleus
Blank 4: DNA
Hope this helps.
The name for the total amount of living matter is biomass. Hopefully this helps :)
Lysozymes is the correct answer.
