The cows live closely with the grass and the both befit from each other
mutualism, where both species benefit (Cows and grass) commensalism, where one species benefits and the other is unaffected(Eyebrow mites and human) parasitism, where one species benefits and the other is harmed.(Catipiller and wasp larva)
POPULATION DENSITY AND DISPERSION
For humans, population density is the number of people per unit of area, usually quoted per square kilometer or square mile.Commonly this may be calculated for a county, city, country, another territory, or the entire world.
Population dispersion is the observation of where individuals are found in a habitat. How individuals "disperse" themselves. There are three main types of dispersion: clumped, uniform and random. Examples Cumped-Cows, Uniform-Birds, and Random-Humans