The unit of density is called derived
unit, why ?

The unit of density is called derived unit because it depends on fundamental units like kilogram,metre and second.

Hope,it will helpyouu!

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.