Unsegmented worms that have psedocoelems and digestive systems with two openings.

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Presentation transcript:

Unsegmented worms that have psedocoelems and digestive systems with two openings.

Environment  Soil  Salt Flats  Water- from polar to tropics Food Source Predators that use body parts to catch, grasp, and EAT. Soil dwellers/Aquatic-eat decaying matter.

Circulation- Relies on diffusion. Respiration- No internal transport system Excretion- Diffusion to carry nutrients and waste through body.

Response  Simple nervous systems- ganglia  Nerves that run length of body transmit sensory info and movement.  Possess sense organs that can detect chemicals given off by prey or hosts.

muscles extend throughout body together with fluid in pseudocoelem make up hydrostatic skeleton reproduce sexually and have individual sexes Pseudocoelom – internal body cavity lacking mesodermal lining

Copy this drawing Or Figure 27-7 Page 689 Vocabulary Pseudocoelom 689 Anus 689

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