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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

The Sundarbans is known for vanishing islands but the scientists said the current retreat of the mangrove forests on the southern coastline is not normal . It can be deduced from the excerpt that mangrove forests

A. have not vanished before 
B. have a habit of vanishing by default 
C. vanished faster a few years before
D. are not located on islands
E. and Sundarbans are two different issues
সঠিক উত্তরঃ B. have a habit of vanishing by default 
Explanation: