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Coevolutionary selective pressures imposed on each other by predator and prey often result in an evolutionary arms race, resulting in antipredator adaptations in the prey and adaptations that improve hunting efficiency in the predator. Two factors are considered here: how close the predator and prey (or host) are, and whether the prey is directly killed by the predator, where true predation and parasitoidism involve certain death.

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Grazing animals generally do not kill their prey, but like predators, they live by feeding on other organisms.The transitive sense of moving an event to an earlier point is the proper one for "predate." "Antedate" is the correct term for occurring before something else.These terms are frequently misused even in educated writing.They are much like parasites in their close associations with their hosts.Unlike typical parasites, they always kill their hosts, but often not instantly.Many predators eat from multiple levels of the food chain.

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