Question

A student decides to test the affects of acidity on plant growth. How should they carry out the experiment?

Get 10 totally different plants so that they can see how acidity affects different kinds of plants.

Get only one plant, and expose it to different amounts of acidity at different times.

Get 10 plants that are as similar as possible, and ensure that they are exposed to the same amount of sun and water, varying only the amount of acidity they're exposed to.

Get 10 plants that are as similar as possible, and expose them all to different amounts of acidity, sun and water

Answer 1

Which one do you believe is correct here?

Answer 2

C?

Answer 3

That's correct. (: