The density wave theory explains spurs and branches along the ...

[Diane]

The density wave theory explains spurs and branches along the spiral arms.
 
  a. True
  b. False
  Indicate whether the statement is true or false

Question 2

A spectral line produced in the atmosphere of a star may be seen as broad whereas interstellar _______________ lines are very narrow.
 
  a. absorption b. continuous
  c. emission d. All of the other choices are correct.

[jordangronback]

Answer to Question 1

False

Answer to Question 2

a

[Diane]

Great answer, keep it coming

[carojassy25]

Thanks for the timely response, appreciate it