Question

experimental design quiz
highlight three (3) constants for this experiment.
a pet store owner wants to see what will happen if they feed tanks of goldfish different amounts of food. one tank of goldfish is fed the normal amount which is once a day, a second tank is fed twice a day, and a third tank is fed four times a day during a six - week study. the fishes’ body fat is recorded daily.

Explanation:

To identify constants, we look for factors that remain unchanged throughout the experiment.

1. Type of fish: All tanks use goldfish, so this is constant.
2. Duration of study: The study lasts six weeks for all tanks, so this is constant.
3. Frequency of body fat recording: Body fat is recorded daily for all tanks, so this is constant. (Other possible constants: same type of food, same tank environment, etc.)

Answer:

1. Type of fish (goldfish)
2. Duration of the study (six weeks)
3. Frequency of body fat recording (daily)