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Predators and PreyPredator – consumer that actively hunts other
living organisms.
Prey – consumed by predators.
Predator and prey populations are linked.
If prey population increases, predator population increases.
Symbiosis
Any relationship in which two species live closely together
3 types:
ParasitismCommensalismMutualism
Parasitism
Relationship in which one organism feeds on the tissues or body fluids of another.
One organism benefits and one organism is harmed.
Host - parasite feeds on this organism.
Ex. – ticks, lice, fleas, tapeworm.
Commensalism
One organism benefits and the other is neither harmed nor helped.
Ex. – Whales & Barnacles – whales are not affect. The barnacles get a free ride & food.
Mutualism
Both organisms benefit.
Some are necessary for the survival of both organisms.
Ex. – yucca plant & yucca moth – cannot survive without one another.