The abundance of a species population, within its habitat, is called (a) relative density (b) regional density

(d) Niche is specific part of habitat occupied by individuals of a species which is circumsribed by its range of tolerance, range of movement, microclimate, type of food and its availability, shelter, type of predator, and timing of activity. A habitat has several ecological niches and supports a number of species. An ecological niche is used by a single species. Two or more species cannot use the same niche despite having a mutualistic association. The abundances of a species population within its habitat is called niche density.