Which element represented most of the atoms in the early ...

[OSWALD]

Which element represented most of the atoms in the early Universe?
 
  a. helium
 b. hydrogen
  c. oxygen
 d. carbon
 e. nitrogen

Question 2

Hydrogen lines are weak in the spectra of hot O-type stars because ____.
 
  a. most of the hydrogen has been converted to helium
 b. a good spectrum of these stars is difficult to obtain
 c. these stars have no atmosphere
 d. gravitational pressure pushes all the hydrogen lines out of the visible spectrum
  e. most of the hydrogen is ionized to high energy levels

[stanleka1]

Answer to Question 1

b

Answer to Question 2

e

[OSWALD]

Thank you!

[stanleka1]

Always glad to help...