Competition occurs when two or more species try to use the same resources. The resources may consist of food, sunlight, water, etc. When species compete for resources there is usually a winner and a loser, the loser usually does not survive.
Commensalism:
Commensalism takes place when one of two species, living in the same habitat, benefits while the other is neither helped or harmed. Some examples of this are barnacles attaching themselves to whales or orchids living on trees.
Mutualism:
In mutualism both species benefit from the interaction. Bees and flowers have a mutualistic relationship.
Predation:
Predation occurs when one species captures and feeds on another species. An example of predation would be humans hunting chicken or cows. Or a cheetah hunting a gazelle.
Parasitism
In parasitism one organism lives on or inside another organism harming it. A tick living on a dog, or another animal, would be an example of parasitism.
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