The ganglia of the sympathetic and the central nervous system in a frog develop from the:

Arrange the following in the correct sequence in the evolution of the nervous system:
$(a)$ Formation of a centralised nervous system.
$(b)$ Diffused nervous system in $Hydra$.
$(c)$ Formation of a ganglion.
$(d)$ Nervous system is lacking in sponges.

The perception of the type of stimulus depends on the

In Hydra,neural organization is comprised of:

The olfactory nerve is the .... cranial nerve.

Dreaming occurs in