Algebra-1

Question Analysis
This question involves identifying causation in a controlled biological experiment.
The main focus is on recognizing that intentional manipulation of a variable (water) leading to a measurable effect (plant growth) with a known biological mechanism (water is essential for plant growth) establishes causation.

Key Concept Explanation
Causation is confirmed when a variable (water) is deliberately changed, and a corresponding change in another variable (growth) is observed, with a clear scientific explanation (plants require water for photosynthesis and nutrient transport).
The use of a control group (unwatered plants) rules out other factors (e.g., sunlight, soil) as the cause of growth, strengthening the causal link.

Step-by-Step Solution
Analyze the experimental design: The class controls all variables except water, with one group receiving water (treatment) and the other not (control).
Evaluate the outcome: W...