<Tr> <Td> </Td> <Td> 49 </Td> </Tr> <Tr> <Td> </Td> <Td> 17.6 </Td> </Tr> <Tr> <Td> </Td> <Td> 3.3 </Td> </Tr> <Tr> <Td> </Td> <Td> 1.0 </Td> </Tr>

Which of the following is not an example of an extrinsic reproductive isolating mechanism