Question

There are two different types of cells in the retina______ which detect shape and movement and is helpful for seeing in dim to dark conditions, and _______, which help us to see sharply and the bright, vivid colors

Answer 1

They are referring to the structures known as rods and cones.

Rods used in low light/dim conditions, so black&white vision basically.

Cones on the other hand are responsible for capable of seeing/distinguishing colors, so they are used for color vision