The nucleus of any atom requires a strong force to hold it together. This strong force is required because

A) the nucleus of any atom is so small.
Generelt
B) protons and neutrons repel each other.
C) positive protons in the nucleus repel each other.
D) the charges of the protons and the electrons cancel each other out.

wavelength divides in half and speed stays the same.

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.