Question

grasshoppers can also spit!
they spit when a person catches them. their spit is wet and brown.
no one knows for sure why grasshoppers spit. they may be showing that they are mad.
what do grasshoppers do when a person catches them?
they make a loud noise.
they spit.
they stop moving.

Explanation:

The text clearly states "They split when a person catches them." So we just need to refer to this statement.

Answer:

They split.