Which Animal Phylum Lacks a Network of Nerve Cells for Gathering

question 26

Multiple Choice

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

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Definitions:

Drooping

Hanging or sagging downwards; a condition of decline or decrease in strength or vigor.

Conjunctivitis

An inflammation or infection of the outer membrane of the eyeball and the inner eyelid, known as pink eye.

Xerophthalmia

A medical condition characterized by dry eyes, often caused by a deficiency in vitamin A.

Trichiasis

A condition where eyelashes grow inward, potentially irritating the eye.