Which animal phylum lacks a network of nerve cells for gathering information from the environment?  

A.  Porifera - sponges
B.  Cnidaria - jellyfish, sea anenomes
C.  Platyhelminthes -- flatworms
D.  Nematoda - roundworms
E.  Mollusca - octopus, squid, clams, snails, and other mollusks


A.  Porifera - sponges

Biology & Microbiology

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What will be an ideal response?

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