The fraction of the moon that receives sunlight changes.
a.) always
b.) never

A

Explanation:

The Sun doesn't move but the moon rotates around the earth making it so that the moon is always receiving different fractions of sunlight at different times. For example,

SUN. EARTH. MOON

︵

( ) O •

‿

as you can see, there is no sunlight hitting the moon._.

if you mean the same part of the Moon, the answer is still A because the Moon rotates and is always at a different spot

the answer is d.) homologous; have mammary glands