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Why do the birds migrate?

Why do the birds migrate? Migratory birds fly hundreds and thousands of kilometres to find the best ecological conditions and habitats for feeding, breeding and raising their young. When conditions at breeding sites become unfavourable,… Why do the birds migrate?

What is called immigration?

What is called immigration? immigration, process through which individuals become permanent residents or citizens of another country. Historically, the process of immigration has been of great social, economic, and cultural benefit to states. What is… What is called immigration?