Question

what is the dependent (responding variable)? number of bubbles produced per minute by plant x in various depths of water a bubbles/min b meters c plant \x\ d depth

Explanation:

In an experiment, the dependent variable is the one that is measured and changes in response to the independent variable. Here, the number of bubbles produced per minute changes as the depth of water (the independent variable) changes.

Answer:

A. bubbles/min