How Was the Mechanism of Sympatric Speciation Among Hemp Nettles

Multiple Choice

How was the mechanism of sympatric speciation among hemp nettles in nature verified experimentally?

A) By simply creating unique hybrids under laboratory conditions
B) By producing hybrids that were 98% fertile under laboratory conditions
C) By producing experimental hybrids that could reproduce successfully with both parent species
D) By producing experimental hybrids that formed fertile offspring with the naturally occurring hybrid
E) By creating hybrids that reproduced through the F ₄ generation before dying from hybrid inviability