The five key characters of mammals and to contrast the protherian, metatherian, and eutherian mammals accordingly with examples of animals that belong to each group. Concept introduction: In the late Devonian era, the aquatic vertebrates evolved to form terrestrial animals. This adaptation is an important step towards the evolution of modern terrestrial vertebrates. By the end of Cretaceous era, the mammals had evolved from amniotic ancestors.

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Chapter 32.8, Problem 11LO

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To describe: The five key characters of mammals and to contrast the protherian, metatherian, and eutherian mammals accordingly with examples of animals that belong to each group.

Concept introduction: In the late Devonian era, the aquatic vertebrates evolved to form terrestrial animals. This adaptation is an important step towards the evolution of modern terrestrial vertebrates. By the end of Cretaceous era, the mammals had evolved from amniotic ancestors.

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