Mammals have the most complex nervous system of all vertebrates.
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Q83: Marsupials are egg-laying mammals.
Q84: The _are aquatic reptiles that lack a
Q85: Lancelets, tunicates, and craniates are all classified
Q86: The_ is the internal membrane of the
Q87: Birds are feathered reptiles.
Q89: The _are craniates that lack a vertebral
Q90: Hagfishes and lampreys differ from other fishes
Q91: Adult tunicates have lost two embryonic features:
Q92: Endothermic animals have four-chambered hearts.
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