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All mammals share several common characteristics.

KEY CONCEPT Evolutionary adaptations allowed mammals to succeed dinosaurs as a dominant terrestrial vertebrate. All mammals share several common characteristics. Mammals are active, large-brained, endotherms with complex social, feeding, and reproductive behaviors.

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All mammals share several common characteristics.

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  1. KEY CONCEPT Evolutionary adaptations allowed mammals to succeed dinosaurs as a dominant terrestrial vertebrate.

  2. All mammals share several common characteristics. • Mammals are active, large-brained, endotherms with complex social, feeding, and reproductive behaviors.

  3. All mammals share four anatomical characteristics. • hair to retain heat • mammary glands to produce milk

  4. All mammals share four anatomical characteristics. • a middle ear with three bones to hear higher-pitched sounds • chewing jaw to break up food quicker

  5. A set of adaptations in the mammalian jaw makes chewing possible. • secondary palate closes off air passages • muscles move jaw side-to-side

  6. Modern mammals are divided into three main groups. • Monotremes lay eggs. • duck-billed platypus • echidna

  7. Marsupials give birth to live young that grow to maturity inside a pouch. • opossum • kangaroo • wombat • koala

  8. Eutherians give birth to live young that have completed fetal development. • most familiar mammals • humans • Eutherians filled many niches after the extinction of the dinosaurs.

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