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Amniote animals - PowerPoint PPT Presentation

The Deuterostomes

The Deuterostomes. Embryonic blastopore becomes the anus. Three body layers. True coelom. Dorsal nerve cord. Phylum Echinodermata. Spiny exterior Calcified internal skeleton Bilateral symmetry in larvae, but often radial symmetry in adults

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Amphibia

Amphibia. Moist skin Eggs laid in water; External fertilization Aquatic larvae with gills metamorphose into air-breathing adults. Amniote Egg. Allows fully terrestrial life. Waterproof shell. Reservoir of water inside the egg. Fertilization is internal, before the shell forms.

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Amniote animals - PowerPoint PPT Presentation

The Deuterostomes

Amphibia