That's the current thinking, anyway: that only natural selection causes permanent genetic change..
当前，只有经过自然选择，基因才会发生质的变化。
Change in current and river depth, also provide natural fishing spots.
改变目前河道和深度，也提供天然钓点。
Change in current and river depth, also provide natural fishing spots.
改变目前河道和深度，也提供天然钓点。
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