The autonomic nervous system has control over

$P$ - Contains unmyelinated nerve fibers.
$Q$ - Contains myelinated nerve fibers.
$I$ - Spinal nerves
$II$ - Autonomic neural system
$III$ - Somatic nerve fibers
$IV$ - Cranial nerves
Select the correct option for $P$ and $Q$.
$\quad\quad P$ $\quad$ $\quad$ $Q$

The effect of oxygen deficiency is primarily observed in which organ?

Which of the following is a function of the parasympathetic nervous system?

The somatic neural system relays impulses:

Provide information on the evolution of the neural system in animals.