$A-$ Humans can sense changes in the environment.
$R-$ Sensory organs detect all types of changes in environment.

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

Proprioceptors are those,which give the sense of

The stimuli of hunger,thirst,blood pressure,and body balance are received by 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.

Dreaming occurs in