It would negatively affect survival. The brown wallaby can camouflage itself more easily in its environment than the white wallaby. The white wallaby would easily seen by predators.
When changes happen in an environment. Many things can and will happen. If there was a gene mutation for the color of beetles, then that would affect their survival because the old color could have helped them hide and be camouflage. (however you spell it) If that is changed it could make them more out in the open, so predators could get them easier. Which would result in less beetles and more predators. Some examples are like the white wallaby, because of its environment it changes color to blend in and survive.
In an experiment, it is important that everything is exactly the same in order to achieve correct results. The only exception are the variables, the independent variable and the dependent variable.
