Define the location and function of the following:
$(1)$ Nerve net
$(2)$ Dendrites

(N/A) $(1)$ Location: Invertebrate animals like $Hydra$ possess a nervous system in the form of a nerve net.
Function: It provides coordination throughout the body.
$(2)$ Location: These are cytoplasmic processes arising from the anterior region of the cyton (cell body) of nerve cells.
Function: They conduct nerve impulses towards the cyton.