Question

jonathan has a pet goldfish. after several months the goldfish quits growing. jonathans mom told her the goldfish might have stopped growing because the tank is too small. jonathan measures the size of her goldfish in its current tank, and then puts the goldfish in a larger tank. after 2 months the goldfish is now 1.5cm longer! identify the independent variable in this experiment. a tank size b the length of the fish c water in the tank d the species of fish

Explanation:

In an experiment, the independent variable is the factor that is deliberately changed or manipulated. Here, Jonathan changes the tank size to see its effect on the goldfish's growth. The length of the fish is the dependent variable (changes based on other factors), water in the tank is a possible confounding variable, and the species of fish is constant.

Answer:

A. Tank size