1 A student collects several plants and pebbles from a riverbank, places them in an aquarium,
and records observations for 15 days. The sizes of the plants increase, while the sizes of the
pebbles remain the same. The student classifies the pebbles as nonliving things.
Which criteria does the student use as the basis for the classification?
A ability to grow
B ability to move
C ability to reproduce
D ability to respond to stimuli