Accretion among the grains in the solar nebula would have been ...

[kwoodring]

Accretion among the grains in the solar nebula would have been aided by
 
  a. static electricity.
  b. gravity.
  c. high-velocity collisions.
  d. all of the above
  e. none of the above

Question 2

The habitable zone 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.

[xiazhe]

Answer to Question 1

A

Answer to Question 2

B

[kwoodring]

Gracias!

[FergA]

TYSM