Question

the passage below describes an experiment. read the passage and then follow the instructions. dr. watson 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. watson 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. watson measured the amount of oxygen in each culture tank. complete the sentence. in this experiment, the amount of oxygen in the tanks was a dependent variable an independent variable

Explanation:

The amount of oxygen depends on the species of algae and its growth. As the algae grow, they produce oxygen, and the amount of oxygen measured is the result of the algae - related factors. So, it is a dependent variable.

Answer:

a dependent variable