Comparative embryology is the study of similar
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among embryos. Some of these similarities are only present in the
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and not in their
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. For example, all animals that have a
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have gill slits and tails as some point in their embryonic development. As the animal grows, these characteristics
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in animals that live on land, but are still present in the animals that
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. Organisms that
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traits are more closely related. These similarities in embryonic development show how some animals may share a
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