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Question: natural selection can be compared with the process of passing...

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Natural selection can be compared with the process of passing a gravel-mix through a sorting machine, and getting separate piles of gravel, each with its own pebble size. In this analogy, 1. Which part of natural selection is represented best by the gravel mix before it's sorted? 2. Which part of natural selection is represented by the sorting machine?

a. Over-reproduction

b. Struggle for existence

c. Variation in a population

d. The environment

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