Which animal phylum lacks a network of nerve cells for gathering information from the environment?
A)Porifera - sponges
B)Cnidaria - jellyfish,sea anemones
C)Platyhelminthes -- flatworms
D)Nematoda - roundworms
E)Mollusca - octopus,squid,clams,snails,and other mollusks

Question

Quizplus · Accepted Answer

Porifera (sponges) do not have a nervous system or nerve cells, and therefore lack the ability to gather information from the environment. The other phyla listed all have nerve cells and some form of nervous system.

Which Animal Phylum Lacks a Network of Nerve Cells for Gathering