mutualism-the doctrine or practice of mutual dependence as the condition of individual and social welfare
competition-the effort of two or more parties acting independently to secure the business of a third party by offering the most favorable terms
predation-the killing by one living organism of another for food
parasitism-an intimate association between organisms of two or more kinds
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contractors in competition for the contract to build the new school
These small fish are most vulnerable to predation just after sunset, when larger fish, such as barracuda and jacks, chase them into the shallow water near shore to feed on them.
one in which a parasite obtains benefits from a host which it usually injures
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