competition and predation

Competition: one wins, one loses 
Could be energy, food, mates, money, whatever
Competitive exclusion principle: only one winner (assumes a limited resource)
This impacts evolution: if there is overlap between two competitors for a limited resource, natural selection will favor the ones that don't overlap, since they don't have to compete for those resources:
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This is called Resource partitioning (biologists love words like this)Note that the two curves separate...
Predator-prey and other fun stuff:
Predation: one lives, one dies, example lion eats a zebra
Parasitism: one lives, other lives off of them (bad manners to kill the host), example worms
Mutualism: both win, example Egrets on back of horses or cows: egrets eat bugs, horse protects the egrets from ground predators
Commensalism: one wins, the other does not care, example orchids growing on branches
Herbivory: only plants die (e.g. cows)
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