What makes sativa and indica have the effects they have?

In other words is the pure THC extracted from any marijuana plant the same? and then the terps and cannaboids what causes the effect?. I’m curious because if that is so then when a individual strain has his THC extracted is it just the terps and cannabis that they reintroduce to it that make it have the effects of the original strain? Sorry if this is a confusing question.

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