Tyler wants to know how the growth of tomato plants is affected by the quantities of various gases in the atmosphere. What type of scientific investigation should Tyler conduct in order to accurately answer his question through direct observations?

Question

A.
Tyler should perform a controlled experiment.
B.
Tyler should ask a professional gardener about tomato plants.
C.
Tyler should grow tomato plants in his back yard.
D.
Tyler should research tomato plants on the internet.

Answer 1

A.
Tyler should perform a controlled experiment.