Question

The sponges are

• A. Mostly marine and a few freshwater forms.
• B. Mostly freshwater and a few marine forms.
• C. Both marine and freshwater forms.
• D. Mostly marine and a few are terrestrial and freshwater forms.

Answer 1

The correct option is A Mostly marine and a few freshwater forms.

This is the only phylum with no nerve cells (nervous system)