Why has India a rich heritage of flora and fauna?

India is a vast country with a variety of climatic regions. India has hot and dry desert, wet and warm tropical region, cold and dry lofty mountains, vast coastline etc. Different climatic conditions allow a huge variety of flora and fauna in India. India has some biodiversity hotspots like Eastern Himalayas and Western Ghats. They are home to many unique and endangered species. All these factors make India rich in flora and fauna.