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Ecology crossword puzzle

Across
A series of organisms each dependent on the next as a source of food.
the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
An animal or person that eats food of both plant and animal origin.
An organism that harbors a parasitic, a mutual, or a commensal symbiont, typically providing nourishment and shelter.
a graphical model of energy flow in a community.
An animal that feeds on plants.
species moving into a range from elsewhere.
home or environment of an animal, plant, or other organism.
Down
decomposes organic material.
An environmental condition that limits the growth, abundance, or distribution of an organism or a population of organisms.
An organism that lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense.
The place or function of a given organism within its ecosystem.
a biological community of interacting organisms and their physical environment.
Organisms of an ecological food chain that receive energy by consuming other organisms.
a system of interlocking and interdependent food chains.