Over what distance does a constant horizontal force of 420 N give a friction-free 74.0-kg skater, initially at rest, a speed of 9.70 m/s?

use photo math tells u all the answers thats what i use

answer: the correct answer for the fill in the blank is rods.

rods are the specialized photoreceptor cells that are present in the retina of human eye. they are responsible for vision in the night time ( also called scotopic vision). they have very low visual acuity and color distinguishing ability.

as they are responsible for vision in night time, therefore they are found predominantly in the nocturnal animals.