Question

Robert Koch verified the germ theory of disease in 1890 in experiments using rabbits. He first isolated a pathogen (Bacillus anthracis) from a sick rabbit and noted that the organism was not present in healthy rabbits. Bacillus anthracis is the causative agent of anthrax, which leads to illness and death in the rabbits. He next injected healthy rabbits with the strain. Other rabbits may have been mock injected with a sterile solution. For this experiment, identify the independent variable, the dependent variable, the control group, and the treatment group.

Answer 1

The correct answer are -

Control Group - Rabbits mock injected

Independent Variable - injection

Dependent Variable - illness

Treatment group - Rabbits injected with Bacillus

Step-by-step explanation:

In this experiment the interdependent variable injection as it is the variable that if it will be change it will test the dependent variable of the experiment. Where the dependent variable is the variable that is subject to test or measured in particular experiment, illness in the rabbits is dependent variable here.

Control group of an experiment is rabbits with mock injection or and treatment group would be rabbits with the bacillus injected as they are subject to the treatment.