The annual rainfall less than 10 cm/yr defines a biome as a desert.
A desert is a biome which receives less than 10 inches of rainfall per annum and has no or sparse vegetation.
In ecological terms, the limiting factor refers to any natural resource or condition which limits the population size.
The rainfall received by a desert biome is very less and the water received as precipitation either gets evaporated or gets frozen in hot and cold deserts respectively.
Thus, option "B" is correct,the annual rainfall less than 10 cm/yr.
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