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In which year did UNESCO declare the Sundarbans of Bangladesh as a world heritage site?
The melody of Bangladesh's national anthem, "Amar Sonar Bangla" was derived from the song "Ami Kothay Pabo Tare". It was sung by whom?
How many types of paper notes are there in Bangladesh?
The total number of independent countries in the world is
Which is the most harmful ray for animal planet?
SARS-Co V-2 stands for what?
The deepest sea of the world is
