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Ch. 5 Vocabulary

Name: _________________________________________
Across
An organism that lives on or in the living body of another species, known as the host, from which it obtains nutrients.
A series of plants and animals linked by their feeding relationships.
The natural process in which those organisms best adapted to the conditions under which they live survive and poorly adapted forms are eliminated.
The natural environment in which an organism normally lives.
An organism that is able to produce its own food from nonliving materials and that serves as a food source for other organisms in a food chain.
An organism that has been introduced to an area to which it is not native.
An organism such as a bacterium or fungus that feeds on and breaks down dead plant matter, making essential components available to plants and other organisms in the ecosystem.
A process used by plants, algae, and many species of bacteria to convert energy captured from the sun into chemical energy that can be sued to fuel the organism's activities.
A species that has been introduced by human action to a location where it did not previously occur naturally.
An animal that eats the organic material of dead plants and animals.
Down
An animal that lives by capturing and eating other animals.
An animal that is eaten by a predator.
A group of individuals of the same species occupying a specific area.
A group of plants and animals living and interacting with one another in a particular place.
To actively seek and use an environmental resource in limited supply that is used by 2 or more plants or animals or kinds of plants or animals.
An animal that eats plants; an herbivore.
The maximum number of individuals in a population that the ecosystem can support.
A group of organisms that occupy the same position in a food chain; each step of an energy pyramid.
A graphic representation that shows the relationship between energy and trophic levels of a given ecosystem.
An organism that feeds on other organisms in a food chain.
The function, position, or role of a species within an ecosystem.