Final answer:
A biodiversity hotspot is a region with high endemism and diversity facing habitat loss, critical for conservation efforts.
Explanation:
Biodiversity hotspot refers to a region with a high level of endemism and diversity that is also facing significant habitat loss. These hotspots are crucial for conservation efforts due to their unique species compositions and the threats they face. The original criteria included 1500 endemic plant species and at least 70% habitat loss.
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