Milan is measuring the density of ethanol. He weighs a bottle three times: first, empty; then filled with water; then filled with ethanol. Here are his
results:
mass of empty bottle =
30.0g
mass of bottle filled with water = 90.0g
mass of bottle filled with ethanol = 78.0g
i Calculate the volume of the bottle.
ii Calculate the mass of the ethanol.
iii Calculate the density of ethanol.​

false

hope this : d

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.