A geographic boundary marking the limits of the potential distribution of species is sometimes referred to as :
Bioclimatic frontier
Bioclimatic frontier option is correct.
A bioclimatic frontier, sometimes called a climatic envelope or bioclimatic limit, is the geographical boundary that marks the outer edge of the climatic conditions under which a species can potentially survive and reproduce. It is defined not by physical barriers such as mountains or oceans but by combinations of temperature, moisture, radiation and seasonality that fall within the species' tolerance range. Biogeographers use bioclimatic envelope models to project such frontiers onto maps and to anticipate how they will shift as the climate changes.
Because it delimits the potential distribution rather than the realised one, a bioclimatic frontier can extend beyond the area a species actually occupies, since dispersal barriers, biotic interactions and human activity may exclude the species from parts of its climatically suitable range.
Speciation is the evolutionary process by which new species arise; geographic isolation is one of its mechanisms and refers to physical separation of populations rather than to a climatic limit; polyploidy is a chromosomal mode of speciation particularly common in plants. None of these terms describes a geographic climatic boundary, which is exactly what the bioclimatic frontier does.
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.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
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