<Tr> <Td> D. mojavensis </Td> <Td> </Td> <Td> 12 </Td> <Td> Direct </Td> <Td> </Td> <Td> Pre-zygotic </Td> <Td> </Td> </Tr> <Tr> <Td> Development time </Td> <Td> 13 </Td> <Td> Divergent </Td> <Td> Yes </Td> <Td> None </Td> <Td> 1998 </Td> </Tr> <Tr> <Td> D. adiastola </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Yes </Td> <Td> Pre-zygotic </Td> <Td> </Td> </Tr> <Tr> <Td> D. silvestris </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Yes </Td> <Td> </Td> <Td> 1980 </Td> </Tr>

Which of the following conditions can lead to two populations becoming different species