Species interactions: predation, competition, mutualism, commensalism, and parasitism
Species in an ecosystem interact in several key ways. In predation, one organism hunts and eats another; in competition, organisms struggle for the same limited resources, like food, water, or space. Symbiosis is a close, long-term relationship between two species: in mutualism both species benefit, like bees and the flowers they pollinate; in commensalism one benefits while the other is not noticeably affected, like barnacles riding on a whale; and in parasitism one benefits at the other's expense, like a tick feeding on a dog. These relationships help keep populations in balance, so a change in one relationship can ripple through the whole ecosystem.
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