22) Some Jovian moons may have liquid water

9) One type of early pre-cell (vesicle) probably consisted of small droplets of

41) A section of DNA that does not correspond to a known protein is referred to as

23) Venus may have been more Earth-like in the past because

28) Analysis of comet dust collected and returned to Earth by the Stardust mission has shown that

20) What was one reason that RNA was eventually replaced by DNA as the molecule of choice for storing genetic information?

33) What kind of clouds are known to exist on Mars?

35) The Martian meteorite ALH84001 was found in the

7) What was ***NOT*** an important source of prebiotic molecules (e.g., amino acids) on the early Earth?

6) Temperatures on Mercury are