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নীচের কোনটি বায়ুদূষণের জৈব নির্দেশক ?
Which of the following is a bioindicator of air pollution?
(D) লাইকেন
লাইকেন বায়ু দূষণের জন্য ভাল জৈব-সূচক হিসাবে কাজ করে।