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Sensitive eye spots - PowerPoint PPT Presentation

Platyhelminthes

Platyhelminthes. Flatworms. Simplest animals to have bilateral symmetry. Have 3 cell layers. Have a gut but no body cavity. Have only one opening to the gut. Respire by diffusion so they have to be flat so that all cells will have access to oxygen. Have definite organs.

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588 views • 44 slides

Phylum Echinodermata: Sand Dollars, Starfish, and Sea Urchins

Phylum Echinodermata: Sand Dollars, Starfish, and Sea Urchins. By: Amanda Brainerd. Key Characteristics . Endoskeleton Five-part radial symmetry Water-vascular system Skin Gills No head or brain. Anatomy. Sieve Ring canal Tube feet Anus Stomach Digestive glands Skin gills

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407 views • 13 slides

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Platyhelminthes

Phylum Echinodermata: Sand Dollars, Starfish, and Sea Urchins