I need help ASAP

PLIS

Mouth: Closed. Operculum: Opened. Floor of buccal cavity: Raised

Explanation:

When fish breathe out, the mouth closes and muscles raise the floor of the buccal cavity and push in the walls of the operculum. The opercula opens and water is pushed out over the gills' surface.

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the answer is c) an oak tree

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.