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Answer: 4. Amazon forests

Key idea: The Amazon rainforest has the highest species diversity on Earth.

It holds more than 40,000 plant species, about 1,300 bird species and 427 mammal species, besides huge numbers of insects and other animals. The Western Ghats, Himalayas and Madagascar are biodiversity hotspots but have lower overall diversity.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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