The main source of energy for a star as it grows in size to ...

[erika]

The main source of energy for a star as it grows in size to become a red giant is
 
  A) hydrogen fusion in the central core.
  B) helium fusion in the central core.
  C) hydrogen fusion in a shell surrounding the central core.
  D) gravitational contraction.

Question 2

Which two properties are most important in determining the surface temperature of a planet?
 
  A) composition and distance from the Sun
  B) size and chemical composition
  C) size and atmosphere
  D) internal temperature and atmosphere
  E) distance from the Sun and atmosphere

[Kjones0604]

Answer to Question 1

C

Answer to Question 2

E

[erika]

TYSM

[frankwu0507]

Thanks for the timely response, appreciate it