The answer is A. random gene pool changes in small population.
<span>Tropical rainforest has the biggest diversity
of species; temperate deciduous forest is known on winter and boreal forest (or
taiga) is the largest biome of them all. The three soil types are sand, silt,
clay, peaty, chalky and loamy. The richest soil would be loam which is preferred
when planting.</span>
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C. the periodic rise and fall of the ocean surface
