3. A scientist designs an experiment to test how the intensity, or strength, of light affects plant growth. Which of the following should be consistent among the plants he tests? Mark all that apply. (4 points)

the quantity of water given to the plants
the type of soil used for potting the plants
the type of plant used for the test
the length of time the plants are exposed to light

Question

3. A scientist designs an experiment to test how the intensity, or strength, of light affects plant growth. Which of the following should be consistent among the plants he tests? Mark all that apply. (4 points)

the quantity of water given to the plants 
the type of soil used for potting the plants 
the type of plant used for the test 
the length of time the plants are exposed to light