An animal species normally active at night (or nocturnal) would be expected to have a visual system that consists primarily of

A) rods.
B) cones.
C) bipolar cells.
D) ganglion cells.

Nocturnal

Describing organisms that are active during the night and rest during the day.

Rods

Photoreceptor cells in the retina of the eye that are sensitive to low light levels and are crucial for night vision.

Visual System

The part of the central nervous system which enables organisms to process visual detail, and includes the eye, the optic nerves, and the brain's visual cortex.