Question

a fair test in which variables are manipulated, controlled, and measured to gather evidence to support or not support a hypothesis. which vocabulary term does this image represent? observational investigation experimental investigation comparative investigation

Explanation:

In an experimental investigation, variables are manipulated (e.g., adding fertilizer in one plant - setup and not in the other), controlled (keeping sunlight and water the same for both plants in the image), and measured to test a hypothesis. Observational investigations just observe without manipulating variables. Comparative investigations compare different groups or conditions but may not involve the same level of variable - control as experimental ones.

Answer:

B. experimental investigation