... a particular species —living in a given geographic
Population is studied in a wide ... productive), or cultivated area. A particular geographic
area of land is said to have a carrying ... may also mean the process of populating a geographic
area, as by procreation or immigration.
... second question first, there are several broad geographic
The proposed species are ... —at either extreme of the population's geographic
distribution, typical individuals are clearly ... in weight and colour. In contrast, over the same geographic
range, black-backed (northern) and white-backed ...
Alfred Russel Wallace
... a paper, "On the Law Which has Regulated the Introduction of Species" (1855) , in which he gathers and enumerates general observations regarding the geographic
and geologic distribution of species, and concludes that "Every species has come into existence coincident both in space and time with a closely ...
... isolated geographically, for example by habitat fragmentation or migration. Sympatric speciation occurs when new species emerge in the same geographic
area. Ernst Mayr 's peripatric speciation is a type of speciation that exists in between the extremes of allopatry and sympatry. Peripatric ...
Modern evolutionary synthesis
... as a result of genetic drift , gene flow and natural selection . Speciation occurs gradually when populations are reproductively isolated by geographic
The modern evolutionary synthesis continued to be developed and refined after the initial establishment in the ...
... blood type requires the presence of both A and B antigens, the AB blood type is the rarest of the ABO blood types. There are known racial and geographic
distributions of the ABO blood types  .
The precise reason why people are born with antibodies against an antigen they have never been exposed ...