Natural selection would be the sick or weak of the herd being picked off by predators, which would leave the most fit specimens to breed.
Natural selection explains adaptive change in the immediate environment.
Survival of the fittest would be used to describe this situation.
Natural selection requires that individuals in a population are
What population? Perhaps you mean if there were no variation for natural selection to select from.
This type of natural selection is called stabilizing selection because the mean traits of the population are being selected for against the immediate environment.
Natural selection explains adaptive change in the immediate environment.
Survival of the fittest would be used to describe this situation.
Natural selection does work on preexisting variations in a population. This is how the population was shaped to be the way that they currently are or were.
Natural selection requires that individuals in a population are
No, there is no genetic variation upon which natural selection can operate.
What population? Perhaps you mean if there were no variation for natural selection to select from.
No, natural selection works on that genetic variation presented to it.
Evolution, of course. Evolution can happen without natural selection in some cases; drift, flow. Generally though, natural selection causes evolution and then, by definition, would come first.
Natural selection explains the process of evolution: evolution by natural selection. It basically means that species with the highest fitness (survival rate) will live, and be selected by nature for the characteristics they possess that make them more apt to survive. Because of natural selection, evolution occurs.
The answer lies within
It is stabilizing selection
This type of natural selection is called stabilizing selection because the mean traits of the population are being selected for against the immediate environment.