study of the interactions of organisms with other organisms and with the physical and chemical environment

place where an organism lives and is able to survive and reproduce

group of organisms of the same species occupying a certain area and sharing a common gene pool

assemblage of species interacting with one another within the same environment

levels of organization that proceed from the individual organism to the population, to the community, and finally to an ecosystem

biological community together with the associated abiotic environment; characterized by a flow of energy and a cycling of inorganic nutrients

zone of air, land, and water at the surface of the Earth in which living organisms are found

properties of the rate of growth and the age structure of populations

the number of individuals per unit area or volume living in a particular habitat

the pattern of dispersal of individuals living within a certain area

abiotic and biotic components of an environment that support or are needed by living organisms

resource or environmental condition that restricts the abundance and distribution of an organism

maximum population growth rate under ideal conditions

growth rate dependent on the number of individuals that are born each year and the number of individuals that die each year

group of individuals having a statistical factor in common, such as year of birth, in a population study

probability of newborn individuals of a cohort surviving to particular ages

show the number of individuals of a cohort that are still living over time

in demographics, a display of the age groups of a population; a growing population has a pyramid-shaped diagram