biology. can you help with one thing?

Scott S · #1 (**permalink**) 04-10-2008, 01:30 AM

1.Which of these animals has bilateral symmetry?
A) sponge
B) hydra
C) jellyfish
D) flatworm

Grace P · #2 (**permalink**) 04-10-2008, 01:33 AM

D) has bilateral so it has all three tissue layers
a sponge doesn't really have any symmetry and is consider irregular (just a clump of cells) with no tissues. A hydra and jellyfish both belong in the same phylum Cnidaria. Hydras are in Class Hydrozoa and have radial symmetry. Jellyfish are in Class Scyphozoa and also have radial symmetry. Both have 2 tissue layers.

emucompboy · #3 (**permalink**) 04-10-2008, 01:34 AM

D) flatworm

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