Which is the best example of the law of conservation of energy? A basketball stops bouncing because its energy disappears. A rolling skateboard slows down because some of its kinetic energy changes to heat. A falling book hits the ground and all of its energy is destroyed. A toy car gains speed as it moves down a ramp because the ramp creates energy.

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

What shape would a molecule with two bound groups and two lone pairs have?