Supermassive black holes erupt in ____. a. any type of galaxy, ...

[lilldybug07]

Supermassive black holes erupt in ____.
 
  a. any type of galaxy, and at random times
 b. elliptical galaxies only, when the last of their gas and dust is consumed
  c. galaxies that have been part of a collision or merger
 d. spiral galaxies only, during a burst of star formation
 e. irregular galaxies

Question 2

Absorption lines are produced by ____.
 
  a. atoms that become ionized
 b. electrons that transfer from a high energy level to a low energy level
  c. electrons that transfer from a low energy level to a high energy level
  d. the intensity of agitation of atoms in a hot gas
 e. the motion of an object toward or away from the observer

[Dunkey]

Answer to Question 1

c

Answer to Question 2

c

[lilldybug07]

YES! Correct, THANKS for helping me on my review

[bitingbit]

Gracias!