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বিভিন্ন প্রাণীর বিভিন্ন প্রকার শ্বাস রঞ্জক। Respiratory pigments are involved in transport of oxygen and carbon dioxide, oxygen storage, blood buffering and many other functions. An interesting type of...

বিভিন্ন প্রাণীর বিভিন্ন প্রকার বহিঃ শ্বসন। Respiration is the process by which organisms exchange gaseous substances between body cells or tissues and the outside environment. Generally in higher vert...

বিভিন্ন ভিটামিনের অভাব জনিত ফল। Vitamins are organic components which are required in very less quantities in our diet. Rather than their low quantity they serve a wide range of functions i...

বিভিন্ন প্রকার 'ফলস ফ্রুট' বা 'অপ্রকৃত ফল'। Most of the people like to eat tasty and jucy fruits. Fruits are of great nutritional values as they contain a large number of organic acids, vitamins, miner...

বিভিন্ন 'ফ্লাইট লেস বার্ড' ও তাদের বসতি। More than sixty living flight less birds have been reported on earth till date. A large number of gigantic ancestors of them had become extinct. Two of such ...