Predation and competition among species
Two of the main ways that populations interact with one another is by competition and by predation. In competition, individuals seek to obtain the same environmental resource. In predation, one population is the resource of the other.
One can conceptualize competition as occurring horizonatally on the same resource level, while predation takes place vertically between different resource levels.
Competition and predation comprise environmental pressures on the interacting populations. The coexistence of populations under competition and predation indicates that these populations have accomodated themselves to each other's presence and have evolved ways to survive in spite of the pressures. In other words, they have coevolved.
Predation describes a biological interaction where a predator feeds on its prey. Predators may or may not kill their prey prior to
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