The search for life in the solar system that is similar to life ...

[scienceeasy]

The search for life in the solar system that is similar to life on Earth is essentially a search for
 
  A) organic molecules
  B) liquid water
  C) molecular oxygen
  D) energy sources

Question 2

Why does light seem to go straight through an open doorway whereas sound seems to spread out when it goes through the same doorway?
 
  What will be an ideal response?

[Danny Ewald]

Answer to Question 1

B

Answer to Question 2

It has to do with the relative sizes of their wavelengths. The wavelength of light is << opening size so very small diffraction; sound wavelengths are >> opening so diffraction is significant.