The sponges (Porifera) diverged from other animals early. They lack the complex organization found in most other phyla. Their cells are differentiated, but in most cases not organized into distinct tissues. Sponges are sessile and typically feed by drawing in water through pores. Archaeocyatha, which have fused skeletons, may represent sponges or a separate phylum.
Among the eumetazoan phyla, two are radially symmetric and have digestive chambers with a single opening, which serves as both the mouth and the anus. These are the Cnidaria, which include sea anemones, corals, and jellyfish, and the Ctenophora or comb jellies. Both have distinct tissues, but they are not organized into organs. There are only two main germ layers, the ectoderm and endoderm, with only scattered cells between them. As such, these animals are sometimes called diploblastic. The tiny Placozoans are similar, but they do not have a permanent digestive chamber.
sea anemones, corals, and jellyfish
2007-06-28 14:52:40
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answer #1
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answered by curious 3
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Jellyfish!
2007-06-29 20:04:23
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answer #2
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answered by ▐▀▀▼▀▀▌ ►Megan◄ ▐▄▄▲▄▄▌ 3
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damn
i forget this
i learned this in 4th grade haha...
o wait nvm
it was the turtle that breathes through its ***. haha
2007-06-28 23:00:35
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answer #3
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answered by Version 2.0 4
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a donkey?
Donkey and a** are the same right?
So.. if a donkey was pregnant, the offspring would be eatin with its *** (mom).
That's the best I can come up with.
2007-06-29 02:21:04
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answer #4
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answered by Anonymous
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octopus.
or a squid.
2007-06-28 21:38:13
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answer #5
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answered by V. 3
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starfish i believe.
2007-06-28 21:45:04
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answer #6
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answered by brooklyn152 3
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you
2007-06-28 21:37:11
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answer #7
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answered by kaceychic13 4
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ant
wait, that's an insect....I don't know.
2007-06-28 21:35:32
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answer #8
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answered by Jess 5
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some species of spider??? idk
2007-06-28 21:38:12
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answer #9
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answered by Anonymous
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