The correct options are as follows"
1.B.
Postzygotic isolation is a type of reproductive isolation which keeps species from mating with each other as a result of the differences that developed between them when they are separated by physical boundary. In the question given above, the lizard specie has been separated by the formation of a stream which divide the region into two.
2.B.
Allopatric speciation refers to the mode of speciation that occur when biological population of the same specie become isolated from each other to an extent that it interferes with genetic interchange. It usually occur as a result of change in the environment.
The answer is pelvic outlet. It is because if this is not
large enough and it is small, the baby won’t be able to be carried or delivered
out from the woman’s vagina as it won’t fit the baby and will likely lead to
complications if pushed through.
