question:
During which phase change is heat energy absorbed by a substance?

answer:
liquid to gas

question:
A research scientist repeatedly observes a bird avoiding a specific butterfly species even though it eats other types of butterflies. Which statement most likely explains the behavior of the bird?

answer:
The behavior is learned over the lifetime of the bird.

question:
What is the primary energy source that drives all weather events, including precipitation, hurricanes, and tornados?

answer:
the Sun

question:
Which of the following energy conversions takes place in a battery-operated flashlight?

answer:
chemical -> electrical -> light