Fact 1: Astem is used to store water by some plants. Fact 2: When it rains, the roots absorb water quickly and the plants store the water in the stems. Given the two facts above, some plants store water after absorbing it with what?

Choices: a. the petals. b. Roundworms. c. energy. d. the roots. e. Roundworms.. f. the succulents. g. fibrous. h. the arms.
The answer is:
d.