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biol.
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biological
biological clock
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biological shield
biological stressor
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biological stressor

bi·o·log·i·cal stres·sor (plural bi·o·log·i·cal stres·sors)


noun 
Definition:
 
introduced environmental organism: an organism introduced, accidentally or intentionally, into a habitat in which it did not evolve naturally. The gypsy moth and the fungus causing Dutch elm disease are examples.

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