A student wants to investigate abiotic factors that affect tomato plants.
He obtains four identical tomato plants.
Which of the following investigations might he perform?
A. He could expose each plant to a different population of insects
and then measure how much each plant grows.
B. He could give each plant a different amount of water and then
measure how much each plant grows.
C. He could plant each tomato plant among different types of flowers
and shrubs and then measure how much each tomato plant grows.