Glossary

abiotic
Pertaining to nonliving things.

age structure
The relative number of individuals of each age in a population.

biotic       (by-OT-ik)
Pertaining to the living organisms in the environment.

biosphere       (BY-oh-sfeer)
The entire portion of Earth that is inhabited by life; the sum of all the planetıs communities and ecosystems.

community
All the organisms that inhabit a particular area; an assemblage of populations of different species living close enough together for potential interaction.

demography
The study of statistics relating to births and deaths in populations.

density
The number of individuals per unit area or volume.

dispersion
The distribution of individuals within geographical population boundaries.

ecology
The study of how organisms interact with their environments.

ecosystem
A level of ecological study that includes all the organisms in a given area as well as the abiotic factors with which they interact; a community and its physical environment.

population
A group of individuals of one species that live in a particular geographic area.