Physical are like rivers, lakes , oceans and mountains
And human made /cultural features are like dams, buildings , canals stuff that aren't naturally here
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Below are the choices. the answer is C.
A) mass extinctions, leading to bottleneck effect
B) major evolutionary innovations, leading to rafting to nearby continents
C) a variety of empty ecological niches, leading to adaptive radiation
<span>D) adaptive radiation, leading to founder effect</span>
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