Secretive and wary, weasels are difficult to study in. nature, and many gaps remain in our knowledge of their. reproduction. Two of the species covered in this Wild-. life Note (the ermine and the long-tailed weasel) exhibit.
Extensive - Properties that do depend on the amount of matter present. Mass - A measurement of the amount of matter in a object (grams). Weight - A measurement of the gravitational force of attraction of the earth acting on an object. Volume - A measurement of the amount of space a substance occupies. Length.
Density-dependant factors-. Factors that basically depend on how much of a population lives in an area. For instance: Food, if the amount of species goes way up, then the amount of food goes down. Density-independant factors-. These are factors that affect a population, but are not affected by the population itself.