Question

drag the right word to its definition an inactive substance used in a controlled experiment to test the effects of an active substance. conclusion hypothesis placebo

Explanation:

To solve this, we analyze each term:

• "Conclusion" is a final judgment, not matching the definition.
• "Hypothesis" is a proposed explanation, not matching.
• "Placebo" is defined as an inactive substance in experiments to test active substances, which matches the given definition.

Answer:

The word that matches the definition "an inactive substance used in a controlled experiment to test the effects of an active substance" is "placebo". So we drag "placebo" to the definition box.