What would most likely happen if an engineer were able to reduce the amount of friction between the cars’ wheels and the track? A. The roller coaster would produce more heat.
B. The roller coaster would not produce any sound energy.
C. The roller coaster would go faster.
D. The roller coaster would go slower.

What happens to light waves from a star as the star moves away from earth?

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.