Question

practice it
photoreceptor that is sensitive only to the intensity of light
stick
handle
bolt
coil
rod

Explanation:

In the context of photoreceptors in the eye, rods are photoreceptor cells that are highly sensitive to light intensity. They are responsible for vision in low - light conditions and do not contribute to color vision. Sticks, handles, bolts, and coils are not relevant terms for this biological photoreceptor function.

Answer:

rod