Write the letter of the correct answer in the blank.
1. Stars
a, never grow old
b. always stay young
c. grow old
2. The age of a star is shown by its
a. size and color
b. nearness to the earth
c. position in the solar system
in color
3. Young stars look
a. yellowish
b. bright red
c. dull red
4. As stars grow old, they change their
a, size
b. color
c. shape
5. At the prime of its life, the star is
a. yellowish
b. bluish
c. reddish
6. Blue stars are
a. the coolest
b. the hottest​