Multiple choice

What happens to the shape of an elliptical galaxy as you move from E0 to E?

They flatten out and spirals form
They blow up
They go from round/spherical to an oval/oblong shape
They become a gas cloud

What cosmic accident is believed to from many irregularly shaped galaxies?

Two galaxies colliding
A super nova
A black hole
An exploding white dwarf

come closer and become far apart and become steam/gas

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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.