(1) The Earth's Moon is widely believed to have formed out of

 - (d) An impact event with a Mars-like planet creating a ring of 
       material that condenses into the Moon

(2) The primary argument against comets supplying the Earth's 
water is that

 - (b) The isotopic D/H ratio of water on the Earth doesn't match that 
       of long term comets

(3) Which one of the following is not a fundamental component of the 
Rare Earth Hypothesis?

 - (c) Difficulty of creating organic polymers

(4) A possible argument against the Rare Earth Hypothesis is that

 - (d) All of the above

(5) The atmosphere of Mars is puzzling because

 - (d) Surface features caused by water erosion suggest a thicker 
       atmosphere in the past which should have survived thermal escape

(6) The carbon-assimilation experiment on the Viking landers works 
by

 - (a) Examining whether labelled CO_2 is sequestered in the 
       presence of light 

(7) The argument for why the Martian meteorites show evidence of 
life is

 - (d) All of the above

(8) The primary component of Titan's atmosphere is

 - (b) N_2

(9) Tholins are

 - (b) A product of N_2 and CH_4 atmospheres under electrical 
       stimulation

(10) Europa's subsurface ocean is 

 - (d) We don't know how deep Europa's subsurface ocean is