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Sponges

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by

Salome Gulent

on 22 April 2010

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Transcript of Sponges

SPONGES sponges are inverebrate animals that usually have no body symmetry and never have tissues or organs. sponges mostly live in oceans but can be found in freshwater rivers or lakes. sponges look almost like a hollow bag with a large opening at one end and many tiny pores covering its surface. Sponges reproduce both sexually and asexually.
The sexual reproduction of sponges involves a larval stage that moves. But adult sponges stay in one place. sponges eat tiny single-celled organisms. they filter the organisms from water. sponges get oxygen from water too. the water moves through the sponges pores. and then, oxygen is transferred into the cells. most sponges have spikes. the spikes support its soft body. they also help the sponge defend itself from an animal that might eat it. the spikes can be as sharp as needles but, some fish still eat them. THE END! coral reefs are important because they are home to many species of fish. coral reefs are in danger because divers are always trying to examine them and that messes them up. sponges are beneficial to humans because some substances they give off are used as medicines.
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