The limitation of the spread of a species by regional climatic variations is referred to as a/an:

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A bioclimatic frontier is a geographical area that limits the spread of a species due to regional climatic variations. It refers to a boundary beyond which a species is unlikely to survive due to unfavourable climatic conditions. The other options (sere, habitat, niche, and disjunction) do not specifically refer to limitations of species spread due to climate variability.

The Limitation of the Spread of a Species by Regional