The factor that will be different between the experimental group and the control group is the independent variable.
Explanation:
Scientific experiments are conducted using control and/or experimental groups. The independent variable can be controlled and/or changed in an experiment so that the changes or effects it caused on the dependent variable can be tested. In an experimental group, the subjects are tested with the changes made in the independent variable; whereas, in a control group, the independent variable remains constant. Since the control group does not receive the independent test variable, the results of the experimental group are compared with that of the control group.
If it cannot avoid it, it just find a mechanism to use oxygen and make it less harmful to itself. This is how the process of cellular respiration may have evolved
