Question

NAME THE PHYLUM WHERE NERVOUS SYSTEM IS WITH OUT BRAIN?​

Answer 1

Answer:

This was perplexing because the phylum Ctenophora was considered to be more ancient than that of Porifera (sponges), which have no nervous system at all. This led to the rise of two theories which described how the early nervous system came about.

Explanation:

Answer 2

Answer:

This was perplexing because the phylum Ctenophora