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All of the living and nonliving things that interact in a particular area

Biotic factors

Living things (organisms) in an ecosystem.

Abiotic factors

Nonliving things in an ecosystem.


The specific environment that provides an organism with what it needs


A group of similar organisms that can mate with one another and produce fertile offspring.


The role an organism has in its ecosystem.


An organism that can make its own food.


An organism that obtains energy by feeding on other organisms.


An individual living thing.


Consumers that eat only plants.


Consumers that eat both plants and animals.


Consumers that eat only animals.


A carnivore that feeds on the bodies of dead organisms.


Organisms that break down wastes and dead organisms and return the raw materials to the environment.

Food chain

A series of events in which one organism eats another and obtains energy.

Food web

Overlapping food chains in an ecosystem.

Energy pyramid

A diagram that shows the amount of energy that moves from one feeding level to another in a food web.

Ecological succession

The series of predictable changes that occur in a community over time.


All of the different organisms that live together in an area.

Primary succession

The settlement/establishment of vegetation in an area previously uncolonized by organisms.

Secondary succession

The recolonization of a geographic area, which had been previously settled, but somehow disrupted.

Pioneer plants

Organisms which first colonize an area often lichens and mosses.

Climax community

The most stable type of biome given its geographical area.

Fire, Volcanism, Severe Weather, Agriculture and, Development

The five factors that disrupt an ecosystem and start secondary succession.

Primary Succession Picture

Secondary Succession Picture

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