As adults, certain species of whales possess baleen instead of teeth. Baleen is used to filter the whales' diet of planktonic animals from seawater. As embryos, baleen whales possess teeth, which are later replaced by baleen. The teeth of embryonic baleen whales are evidence that

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baleen whales are descendants of toothed whales.

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all whales are the descendants of terrestrial mammals.

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ontogeny recapitulates phylogeny.

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baleen whale embryos pass through a stage when they resemble adult toothed whales.

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among ancient whales, baleen evolved before teeth.

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As adults, certain species of whales possess baleen instead of teeth. Baleen is ...

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