One of the most important features that must be explained by ...

[swpotter12]

One of the most important features that must be explained by models during the formation of the galaxy is the ____.
 
  a. formation of spiral arms
 b. differences in age and metallicity of stars, especially in the halo
  c. formation of the central supermassive black hole
 d. accumulation of dark matter in the corona
 e. importance of spiral arms to star formation

Question 2

What is an example of the conservation of angular momentum?
 
  a. A volleyball player serves a ball and it follows a parabolic path.
  b. A baseball player strikes the ball with the bat
 c. A cross-country skier accelerates as she moves in a straight line
  d. A skateboarder maintains the same velocity in the same direction
  e. A diver brings his arms and legs closer to his body

[amandalm]

Answer to Question 1

b

Answer to Question 2

e

[swpotter12]

Thank you!

[amandalm]

Always glad to help...