Which nervous system is activated in stress conditions?

Neural crest cells break off from the . . . . . . and later move to the sides of the developing embryo to form . . . . . . .

The system that transmits impulses from the $CNS$ to the involuntary organs and smooth muscles of the body is:

Axons form nerves in

What is the visceral nervous system?

Select the correct option:
$(1)$ The cell body contains typical cell organelles and Nissl's granules / neurotransmitters.
$(2)$ The nervous system of Hydra is composed of a nerve net / ganglia.