Question

the passage below describes an experiment. read the passage and think about the variables that are described. dr. gruber collected two species of algae, chlorella rotunda and tetraselmis cordiformis. he wanted to know whether one species released more oxygen as it grew than the other species. to find out, dr. gruber prepared six culture tanks. he filled each tank with the same amount of a mixture of water and nutrients. then, he added 1,000 live algae cells to each tank and sealed the tank. in three of the tanks, he added c. rotunda cells. in the other three, he added t. cordiformis cells. after five days, dr. gruber measured the amount of oxygen in each culture tank. which of the following was a dependent variable in this experiment? the amount of oxygen in the tanks the species of algae

Explanation:

In an experiment, the dependent variable is what is measured and affected by other factors. Here, Dr. Gruber measures the amount of oxygen in the tanks, which is affected by the species of algae growing. The species of algae is the independent variable that is manipulated.

Answer:

the amount of oxygen in the tanks