The animals that survive are the ones that matter. Say you have 10 bugs and you spray them with poison and 9 of them die, but 1 survives because it has a mutation that makes it resistant to the poison. Now that 1 is the one who has offspring, and they inherit the poison resistance. Eventually all the bugs who can’t resist poison die and the ones that are left all can resist poison. The bug has now adapted to the poison.
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