The number of different species within a given area.

How many organisms are in a particular place.

Where organisms are found within a given area.

The parts of Earth that are covered with land.

The part of the atmosphere that contains living organisms.

The part of the Earth inhabited by living organisms, including land, sea, and lower part of atmosphere.

All the organisms living in a given area.

All the organisms living in a particular area and the non-living aspects of the environment.

The non-living factors of a particular environment.

The plants that exist within a particular environment.

Non-living factors (physical or chemical), or physical environment of an organism.

The living aspects of an environment.

The non-living things that affect an environment.

Part of the living environment of an organism. Affected by the population density.

The number of different species in a given area.

The number of organisms within a given area.

Whereabouts organisms are found in an area.

Where an organism lives and what is does there - the precise role of an organism in its environment.

Where particular organisms live.

How many organisms live within an environment.

Different feeding times

Different speeds

Places of shelter

Different foods

The ecological process in which one community progressively changes to another.

The different organisms that live in an environment.

The combination of biotic and abiotic factors in an area.

Succession that is prevented by natural occurrences.

Succession that occurs due to human activity.

A community remains stable due to human activity.

The final stage in succession. The stage that will remain the same for hundreds of years.

The first community of a succession.

The community that existed before a natural disaster (before secondary succession).

The first species that develops (usually moss and lichens).

The species that remain throughout the whole succession process.

The last species to join the community (e.g. mammals).