Which of the answer choices is a true statement? Select all that apply.

Nonmetals usually exist as molecules, combining with atoms of themselves.

Metallic elements usually exist as molecules, combining with atoms of themselves.

Nonmetals can exist on their own as individual atoms.

Metallic elements can exist on their own as individual atoms.

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.