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Word: metazoan
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Meaning:
Adjective:
- Having to do with animals that develop from an embryo with three tissue layers.
Source: Wiktionary
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Noun:
- zoology Any animal that undergoes development from an embryo stage with three tissue layers, namely the ectoderm, mesoderm, and endoderm. The term applies to all animals except the sponges.
Source: Wiktionary
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