A student measured the weight of 10 male rats fed junk food compared to 10 male rats fed a healthy diet. The average weight of each group can be seen in the table below. What important variable did the student hold constant when she designed this experiment?
Weight in ounces Weight in kilograms
Rats fed junk food 21.1 ?
Rats fed healthy food 16 ?
Multiple Choice
the conversion between ounces and kilograms
type of food
the sex of the rats
change in weight of the rats
1 answer
the sex of the rats