Which of the following resons for absence of life on the gas giants is a direct result of their distance from the sun? A. they have no soild surfaces. B. Their atmosphere have too little oxygen. C. Their gravities are too strong. D. They are too cold to surpport life.

Nitrogen-14 and nitrogen-15 are isotopes of the same element. how do these two isotopes differ? a. they have different numbers of nuclei. b. they have different numbers of protons. c. they have different numbers of neutrons. d. they have different numbers of electrons.