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Bio-geographic isolation is the separation of part/a whole species due to either biological or geographical reasons.
Biological could be lack of food, or a more preferable source of food somewhere else, etc. Geographical could be rivers, oceans, mountains, etc.
Im super good at Biology and the way i remember the answer to this is protein is transcribed and there is mRNA,rRNA, and tRNA. I relate transcribe to tRNA so when I see it i thing transcribe.