Luz raises chickens for eggs. She knows that the diet a chicken eats could contribute to the number of eggs it can lay. She feeds standard chicken feed to all chicken, but separates her flock into two groups. One group is given spinach which is normal, to supplement their diet, while the other group is
given meal worms. Then she counts the number of eggs laid over a month for each group. Luz suspects that the group given meal worms will produce
more eggs. Luz's control group is...
the chickens getting meal worms.
the food she gives them
the amount of time she feeds them.
the chickens getting spinach.