1. Chapter 6 Section 2

2.  Fun Fact: For a long time, scientists thought sponges were plants, not animals.  Adult sponges are sessile- remain attached to one place

3.  Most sponges live in oceans, but some live in freshwater.  Filter food out of water that flows through body  Microscopic organisms and oxygen are carried into central cavity through pores of sponge  Flagella keep water moving though sponge

4.  Soft bodies supported by sharp, glasslike structures called spicules  Some have material called spongin- similar to foam rubber, making bodies elastic and soft  Some have both.

5.  Have tentacles surrounding mouth (ex. Jellyfish, coral, sea anemones)  Tentacles shoot out stinging cells, called, nematocysts, to catch prey  Have radial symmetry, can locate food that floats by from any direction

6.  2 different body forms ◦ Vase-shaped called polyp ◦ bell-shaped body called medusa

7.  Search for food  Invertebrates with long, flattened bodies  Bilateral symmetry  Soft bodies with 3 layers of tissue  Plnaraians- free-living flatworms with digestive system with one opening  Parasites- live in or on their hosts

8.  Most widespread animal on Earth  Body like a tube within a tube, with a fluid-filled cavity between two tubes  Digestive tract has two openings  Some are decomposers, some predators

9.  Pick one question and answer in a complete sentence.  Why would spongin and spicules discourage predators from eating sponges?  What are three characteristics of flatworms and roundworms.