2. where is the greatest biodiversity found?\ntropic regions\ntemperate regions\ndesert regions\npolar regions

Brief Explanations:

Tropical regions have warm, consistent temperatures, high rainfall, and abundant sunlight year-round, creating stable, resource-rich ecosystems that support a vast variety of plant and animal species, far more than temperate, desert, or polar regions which have harsher, more variable or resource-scarce conditions.

Answer:

tropic regions