query: كيف نفصلوا مجموعة صغيرة من الكائنات الحية (عدد صغير من السكان) عن المجموعة الرئيسية من السكان التي ينتموا ليها (مثلا إذا انتقلوا عبر سلسلة جبال أو نهر، ولا انتقلوا لجزيرة جديدة ما ينجموش يرجعوا منها بسهولة)، يلقوا رواحهم في الغالب في بيئة مختلفة عن البيئة الي كانوا فيها في السابق.
positive: When a small group of living things (a small population) gets separated from the main population that they came from (like if they move over a mountain range or a river, or if they move to a new island so that they can't easily move back) they will often find themselves in a different environment than they were in before.
negative: When a large group of living things (a large population) gets separated from the dependent population that they came from (like if they move over a mountain range or a river, or if they move to a old island so that they can't easily move back) they will often find themselves in a same environment than they were in before. When a small group of living things (a small population) gets separated from the main population that they came from (like if they move over a mountain range or a river, or if they move to a new island so that they can't easily move back) they will find themselves in a different environment than they were in before.