Question

multiple choice question scientists on the international space station want to study how microgravity affects plants. why do these scientists use variables? variables help scientists keep track of all the factors that affect plant growth. variables allow scientists expectations to change how the results are analyzed. variables offer a testable explanation for a problem using what the scientists know.

Explanation:

Variables are used in scientific studies to test hypotheses and understand relationships. In this case, to study the effect of microgravity on plant growth, variables help scientists account for all factors that could influence the outcome, allowing for a testable explanation.

Answer:

Variables offer a testable explanation for a problem using what the scientists know.