Question

read the following experiment story and answer the questions that follow. in a middle school lab, mrs. johnson gathered her students for an exciting project: exploring how moisture levels affect earthworm movement. students set up containers with different moisture levels: dry, moist, and waterlogged. they placed one earthworm in each container. they used the same type and size of earthworm in each. they used the same type of soil, but changed the amount of water added to each container. over a week, they measured how far the worms burrowed. the earthworm in dry soil barely moved, while the one in waterlogged soil struggled, but the one in moist soil thrived burrowing the farthest. on the final day, they discussed their findings. “moist soil is best for worms!” one student exclaimed. they created graphs to show their results and returned the worms to a nearby garden, proud of their discovery about the importance of soil moisture for earthworms. which of the following would be a testable question for the experiment? how does the distance earthworms burrow affect soil moisture? if soil moisture increases, then the distance the earthworm burrows will increase. how does soil moisture affect the distance earthworms burrow? soil moisture has no affect on the distance an earthworm burrows.

Explanation:

A testable question is one that can be investigated through an experiment. In this experiment, the students are exploring the effect of soil moisture on earthworm movement (distance burrowed). The first option reverses the cause - effect relationship. The second and fourth are hypotheses, not questions. The third question "How does soil moisture affect the distance earthworms burrow?" can be tested by changing soil moisture levels and measuring the burrowing distance.

Answer:

C. How does soil moisture affect the distance earthworms burrow?