Modern animals - PowerPoint PPT Presentation

Mesozoic Life

Mesozoic Life. Chapter 15 Part 3. Reptiles Dinos Marine Flying Today: mammals. Permian therapsids. Mammal-like reptiles in Permian More vertical legs Fur? Warm blooded?. Transition to mammals. Cynodonts Group of therapsid Late Permian/Triassic Not clearly either reptile or mammal.

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Fig. 18-0a

Animal diversity. Fig. 18-0a. Colonial protists as ancestors of modern animals. Fig. 18-2a. Somatic cells. Digestive cavity. Reproductive cells. Infolding. Colonial protist, an aggregate of identical cells. Hollow sphere of unspecial- ized cells. Beginning of cell specialization.

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