Which characteristic distinguishes earth from the other terrestrial planets

-- being 93,000,000 miles from the sun;
-- being the most dense;
-- having liquid water;
-- having a dense, transparent atmosphere;
-- having surface temperature and pressure in which
water can exist in all three of its phases;
-- having one and only one moon;
-- having life forms on it;
-- having life forms with the possibility of evolving intelligence;

The answer is b im not sure 

Answer b is the answet