Hole hazards

Ultraviolet rays penetratingthrough the protective ozone layerover Antarctica are damaging theDNA of higher animals. Scientistsfrom the Northeastern University ofTexas, US, found extensive DNAlesions in the eggs and larvae of icefish - an Antarctic fish that lackshacmoglobin - during the periodwhen the ozone hole was the widest.In recent years, investigators havefound that reproduction rates ofalgae-plant micro-organisms livingin the underside of Antarctic sea icehave decreased due to the ozonehole. Algae come at the bottom ofthe food chain and are essential forthe survival of marine animals.

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