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According to evolutionary theory, natural selection is the principle that directs evolution.
Adaptation (I'm studying the same thing ;)
These two things are both theories that are pretty much the same thing.
No, they are two different things.
No, its a group thing.
Natural selection is driven by differences in reproductive success between variants within the same population.
The only thing that causes evolution is Mutations due to forced natural selection of desired alleles.
Natural selection is not a thing that acts on populations, it is a tendency for harmful genes to not be passed on (die out) and useful variations to thrive and become common.
Its NaTuRaL sElEcTiOn if you didn't know.
natural selection
Adaptation does not allow for natural selection: natural selection causes adaptation.
The trait is the same for all organisms.