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A biologist studied the population of rats in a granary. He found the average natality was 280, average mortality was 200, immigration was 40 and emigration was 50. The net increase in population is:
(i) How does alien species invasion cause a decline in biodiversity? Explain. How have the following contributed to biodiversity loss? I. Nile Perch II. Lantana and Eichhornia III. Clarias gariepinus (ii) Why have certain regions been declared as biodiversity hotspots by environmentalists of the world? Name any two such regions in India.
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