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Effectus [21]
3 years ago
15

Of all the species that have ever lived on planet earth, what percentage are now extinct?

Biology
1 answer:
erica [24]3 years ago
4 0
I think it's 90% but I am not sure.
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How specifies that are separated for a river, rocks, mountains, forest ; can at some point not being able to interbreed anymore
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Species separated by a physical barrier for a long time, suffer allopatric speciation, so they can not interbreed anymore.

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Allopatric speciation consists of the geographic separation of a continuous genetic background giving place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flow, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.

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