Which class of stars probably has too small a habitable zone for ...

[cagreen833]

Which class of stars probably has too small a habitable zone for life to arise?
 
  What will be an ideal response?

Question 2

The lithosphere of a planet is the layer that consists of
 
  A) material above the crust.
  B) material between the crust and the mantle.
  C) the rigid rocky material of the crust and uppermost portion of the mantle.
  D) the softer rocky material of the mantle.
  E) the lava that comes out of volcanoes.

[jaaaaaaa]

Answer to Question 1

Class M stars are too cool to generate a large habitable zone.

Answer to Question 2

C