Question

question 2
10 points
members of this group do not have a \brain\ but do have a nerve net.
a mollusca
b cnidaria
c porifera
d platyhelminthes
e annelida

Explanation:

Cnidarians (like jellyfish) have a nerve net for basic sensory and motor functions but lack a centralized brain. Mollusca have ganglia and some have more complex nervous systems. Porifera (sponges) lack true nervous systems. Platyhelminthes have a ladder - like nervous system with ganglia. Annelida have a more developed nervous system with a brain and ventral nerve cord.

Answer:

B. Cnidaria