Very urgent more urgent then anything. urgent urgent how is a pure substance different from a mixture?a. mixtures can be separated by physical means. b. pure substances are made up of mixtures. c. a pure substance is heterogeneous. d. a mixture is made of one substance.

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !