The fossil record shows that some animals, such as the horseshoe crab, have existed unchanged for millions of years. other organisms, such as pigs, have undergone a well-documented sequences of changes. which type of organism would be most useful as an index fossil? explain your answer.
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One gene can influence trait(s). one trait can be determined by gene(s).
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The fossil record shows that some animals, such as the horseshoe crab, have existed unchanged for mi...
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