Question

One tank of goldfish is feed once a day, a second tank twice a day, and a third tank four times a day during a six-week study. the fishes' body fat is recorded. what is a controlled variable?
a. body fat of fish
b. type of goldfish
c. amount of food
d. number of times fish are feed/day

Answer 1

The controlled variable is what stays the same . So it’s C . They are given different amounts but the same food.