Which event is an example of a living thing responding to a stimulus?
A. A rock makes a loud sound as it falls down a cliff.
B. The temperature rises during the day.
C. The wind blows the roof off a house during a storm.
D. A houseplant grows toward the window.
All of the other answers are examples of nonliving things. A houseplant, however, is alive, and moves towards the window because it can receive more light.
