The most abundant molecule in Saturn's atmosphere is ________. (Fill in the blank)

The most abundant molecule in Saturn's atmosphere is ________.
 
  Fill in the blank(s) with correct word

Question 2

The gas in an HII region is ________ hydrogen.
 
  Fill in the blank(s) with correct word

Question 3

The Murchison meteorite, a carbonaceous chondrite, contained many of the amino acids needed by living things on Earth.
 
  Indicate whether the statement is true or false

Question 4

Uranus and ________ are very similar in size, mass, and color.
 
  Fill in the blank(s) with correct word

Question 5

Interest in life on Mars has died since the latest surveys have found no signs of liquid water on its surface now.
 
  Indicate whether the statement is true or false