Question

A scientist is designing an investigation to find out what is the amount of light that a plant receives is related to how much food the plant has to help it grow. For her experiment, the scientist plans to get one plant only one hour of light per day another plant five hours of light per day and a third plant 10 hours of light per day. Then she will use a roller to measure how much each plant grows each day. The set up for her experiment is shown below. Which of the following will help make sure that the investigation is a fear test?

a. Use the three different types of lightbulbs.
b. Give the plants with less light more fertilizer.
c. Give each plant the same amount of fertilizer.
d. Use three different types of plants.

Answer 1

c

Step-by-step explanation:

two find the effect of a variable ,which is light in this experiment, all the other conditions should be fixed