DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are polymers of nucleotides linked in a chain through phosphodiester bonds. In biological systems, they serve as information-carrying molecules or, in the case of some RNA molecules, catalysts.NA (deoxyribonucleic acid) and RNA (ribonucleic acid) are polymers of nucleotides linked in a chain through phosphodiester bonds. In biological systems, they serve as information-carrying molecules or, in the case of some RNA molecules, catalysts.
snow petrels live in Antarctica, they are pure white small birds with a pointy beack.now Petrels stay warm because they have especially thick feathers and if they are freezing cold the will fluff up their feathers to stop the heat from escaping.
Snow petrels are birds of the Antarctic, they don't migrate as such but move further north in winter as the cold weather sets in. Research in recent years has shown that the Antarctic ocean beneath the winter ice is surprisingly rich in life-a fact that it seems these birds have known about for some time.ere snow petrels (and in the first photograph a crabeater seal too) are taking advantage of a tide crack to fish through in the case of the birds and to breathe at in the case of the seal who will be busy fishing for krill under the ice.