As far as we know all forms of life on Earth use ____________ as ...

[plus1]

As far as we know all forms of life on Earth use ____________ as a medium for chemical reactions.
 
  a. gaseous helium
  b. gaseous helium
  c. frozen carbon dioxide
  d. liquid water
  e. frozen water

Question 2

The habitable zone around a star is
 
  a. the region on a planet where conditions are acceptable for life to exist.
  b. a region around a star where a planet's temperature would permit the existence of liquid water.
  c. very small for a massive star.
  d. only found around G and K stars.
  e. a region on a young planet where amino acids can begin to form DNA molecules.

[brittanywood]

Answer to Question 1

d

Answer to Question 2

b

[plus1]

Both answers were spot on, thank you once again

[brittanywood]

Great! Please up vote