The ?
principle states that the net electrical force on a specific charge is equal to the sum of
the vector components of the charges applying forces on it.

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.

once a carousel is in motion, the constant movement of the carousel horse around the center of the circle can best be described asacceleration or change in velocity.