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Echinoderms

Echinoderms. Echinoderms are animals with spiny skin, five-part radial symmetry, an internal skeleton, water vascular system, and suctioncuplike structures called tube feet. Sea urchins and starfish are examples of echinoderms.

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Echinoderms

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  1. Echinoderms

  2. Echinoderms are animals with spiny skin, five-part radial symmetry, an internal skeleton, water vascular system, and suctioncuplike structures called tube feet. • Sea urchins and starfish are examples of echinoderms. • The internal skeleton is made up of hundreds of calcium carbonate plates.

  3. The water vascular system is used to help the echinoderm move. • The main structures in the vascular system are tube feet, radial canal, ring canal, and the madreporite. (see figure 29-3 page 639) • The madreporite is where water is pumped into and out of the vascular system.

  4. Many echinoderms are carnivorous, others eat plankton or detritus. • The crown-of-thorns starfish caused a lot of damage to coral reefs in the Pacific Ocean with their large appetite.

  5. Comparing Invertebrates • A phylogenic tree shows which phyla originate from a common ancestor. • A parasitic roundworms that can enter humans from undercooked pork include tapeworms and trichina worms. • Terrestrial invertebrates breath using a variety of adapted organs including book lungs, mantle cavities, and tracheal tubes.

  6. Aquatic invertebrates breath using gills. • Most animals can not breath or pump blood without muscles. • Muscles work by contracting. The muscles get shorter and thicker as they contract.

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