Which statement best describes one way that spiral and elliptical galaxies typically differ? *

O Spiral galaxies are large, but elliptical galaxies are smaller.

Elliptical galaxies contain stars, but spiral galaxies contain dust and gas.

O Spiral galaxies contain young stars, but elliptical galaxies contain mainly old stars.

Elliptical galaxies are held together by gravity, but spiral galaxies are held together by
centrifugal forces.

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 !