When a scientific experiment is carried out in a controlled setting, all variables are kept the same except for the C. experimental. Experimental variables are the things you are studying in the experiment and it is the only variable you can change.
They swam faster and learned to hide
being killed of leaving causing severe damage and leaving the lungs and the immune system of the human body affected by TB weak and defenseless without antibodies and medicine. the healthy cells are basically being killed by the TB bacterium.
