There are three different sized aquariums in your classroom with two goldfish in each. All fish are the same size and age. Your class wants to find out if the size of the tank affects the growth of a fish.
What should be the same to make the experiment valid?
Answer options with 5 options
A.
water temperature, amount of food, type of gravel
B.
type of food, number of plastic plants, color of rocks
C.
type of food, amount of food, water temperature
D.
number of rocks, type of food, amount of food
E.
water temperature, type of gravel, color of rocks