Valerie conducted a controlled experiment on pothos plants, which are common houseplants. Her hypothesis is that the direction of light will affect the growth
pattern of a plant. In one test group, she allowed the plants to receive light from one direction only Valerie observed that the plants in this group bent their
stems and leaves toward the light.
Valerie's observations most strongly demonstrate which of these characteristics of life?
O A response to stimuli from the environment
B. obtaining and using materials and energy
C. evolution, or change over time
D. maintaining a stable internal environment