How does variation lead to natural selection?

2 Answers

Emily Smith Profile
Emily Smith answered
Because different species have different variations, everyone's different. These differences can be useful in some cases and not useful in others. Like for instance, the gazel. Once upon a time the gazel was eating leaves. Then one day all the leaves dissapeared where he could reach it, Then his friend, a slightly bigger gazel with a longer neck came by and ate the leaves just a bit out of reach for the shorter gazel. Over time the short gazel's died and the larger gazel's could breed together producing larger gazel's every generation. The gazel's have been naturally selected (only the bigger gazel's exist) to survive due to their adaptations (their different heights).
Oddman Profile
Oddman answered
Variation and natural selection have no causal relation to each other. Variation can occur without natural selection, and vice versa.

Natural selection is the process by which the "unfit" die before being able to reproduce in numbers that will sustain their population.

Variation is one characteristic of a population that allows some members to survive natural selection. (Another such characteristic is geographic dispersal.)

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