Where does the energy within the greenhouse effect originate? from convection within the atmosphere
from the circular movement of hot and cold air
from solar radiation entering the atmosphere
from the conduction of heat from the ground to the air

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.