A student made the following observations about astronomical bodies. Observation 1: Mars reverses its direction of motion in the night's sky.
Observation 2: The stars move across the sky.

Which observation(s) can be explained using the heliocentric model but not the geocentric model?

(A)Only observation 1
(B) Only observation 2
(C) Both observation 1 and observation 2
(D) Neither observation 1 nor observation 2

where is the

friction

explanation:

they us to move forward and backwards

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.