Two pool (billiard) balls collide, causing each to move in a different direction. Eventually, both come to a stop. The most important factor in causing them to stop is
OPTIONS:
- balance.
- friction.
- gravity.
- size.

friction.


Which behavior can help animals establish a territory?
OPTIONS:
- A caribou herd migrates seasonally.
- A scent trail leads ants to a food source.
- A wolf pack howls to warn other wolves to stay away.
- A honeybee society divides the work between its members.

A wolf pack howls to warn other wolves to stay away.


As the molecules of water begin to slow down they go into a phase where they are no longer able to easily move past each other. The water is passing through a phase change and will
OPTIONS:
- remain a mixture.
- remain a compound.
- become an element.
- become a compound.


remain a compound.