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Lecture 64

Lecture 64. Mr. Sover 18-19 February 2010. Collect Homework. Pass Back Homework Questions?. Importance/Destruction. Destruction of the Reef Destruction of the Reef Trawling. Flatworms. Simplest animals with bilateral symmetry

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Lecture 64

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  1. Lecture 64 Mr. Sover 18-19 February 2010

  2. Collect Homework • Pass Back Homework • Questions?

  3. Importance/Destruction Destruction of the Reef Destruction of the Reef Trawling

  4. Flatworms • Simplest animals with bilateral symmetry • In addition to the endoderm and ectoderm, they have a mesoderm • Increasing complexity • Single opening (like cnidarians) • The anterior end has a primitive brain and sensory organs • Sexual/Asexual

  5. Tapeworms

  6. Roundworms • Salt/freshwater, soil, parasites • Body plan • 2 distinct openings • Regional specialization • Food intake, digestion, absorption, excretion • “Tube within a tube” • Support for organs • Resistance for muscles • Reproduction • sexual

  7. The rest of animals • Have coelom (a body cavty that forms within the mesoderm) • organ protection • Fluid of coelom keeps the organs moist

  8. Segmented Worms • Earthworms • True coelom • Most segments contain the same internal structures • Complex digestive tract • Esophagus, intestine, anus • Gas exchange through skin • Primitive nervous system • Separate sexes, but also hermaphroditic

  9. Homework • P. 97-99 Study Guide

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