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Across
1.An organism that can make organic molecules from inorganic molecules; a photosynthetic or chemosynthetic autotroph that serves as the basic food source in an ecosystem.
4.A community of organisms and their abiotic environment.
5.A large region characterized by a specific type of climate and certain types of plant and animal communities.
7.An organism that eats other organisms or organic matter instead of producing its own nutrients or obtaining nutrients from inorganic sources.d
8.The extent to which or the limits beetween which variation is possible.
10.The place where an organism usually lives.
11.Third in order or level.
14.An organism that feeds by breaking down organic matter from dead organisms, examples include bacteria and fungi.
17.Study of the interactions of living organisms with one another and with their environment
18.The part of the Earth where life exists.
19.An environmental factor that is associated with or results from the activities of living organisms.
20.Group of organisms of the same species that live in a specific geographical area and interbreed.
Down
2.A group of various specis that live in the same habitat and interact with each other.
3.The number of individuals of the same species that live in a given unit of area.
6.An animal that feeds on plants.
9.The unique position occupied by a species, both in terms of its physical use of its habitat and its function within an ecological community.
12.An organism deriving its nutritional requirements from complex organic substances
13.Can only thrive in a narrow range of environmental conditions or has a limited diet.
15.A number of people or things sharing a specified characteristic and following one after the other.
16.A diagram that shows the feeding relationships between organisms in an ecosystem.

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