graph of the numbers of males and females within different age groups of a population

The amount of biological or living diversity per unit area. It includes the concepts of species diversity, habitat diversity and genetic diversity.

Increasing concentration of a harmful substance in organisms at higher trophic levels in a food chain or food web

Largest number of individuals of a population that a environment can support

change in a population from high birth and death rates to low birth and death rates

The process by which formerly fertile lands become increasingly arid, unproductive, and desert-like.

The amount of biologically productive land and water needed to support a person or population.

Growth pattern in which the individuals in a population reproduce at a constant rate

species that enter new ecosystems and multiply, harming native species and their habitats

Growth pattern in which a population's growth rate slows or stops following a period of exponential growth

A material that will not breakdown in nature

a resource that cannot be replaced