The factor being tested is the variable. There are two types of variables, independent and dependent. The independent variable is the factor being changed by the scientist or the person controlling the experiment. The dependent variable is the thing that gets changed due to the changing of the independent variable. The dependent variable cannot be changed physically by the person doing the experiment.
More action is needed to ensure safeguards are in place to protect these areas. Nature reserves and other ways of setting land aside to protect species had been a key strategy in the conservation of biodiversity.
Density= mass/volume
volume=mass/density
mass= volume•density
Please rephrase the question, it doesn't make sense.
