A student demonstrates how water moves through an ecosystem by making a small-scale model of earth's surface. the student follows these steps:
1.) place a small amount of soil in a large plastic cup
2.) place a seed in the soil
3.) slowly add water to the soil
4.) cover the top of the cup with plastic wrap

based on how water moves through an ecosystem, which step would most likely come next?
a place the cup in the dark
b. turn the cup upside down
c. uncover the top of the cup
d place the cup in sunlight