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The lens of the eye is normally transparent, allowing light through to the retina in back of the eye. A cataract causes the lens of the eye to become cloudy or opaque, decreasing or eventually blocking light to the retina, causing impaired vision and eventually blindness. Cataracts can be hereditary or caused by disease such […]
These days, zoos have to make difficult choices as to which species that are in danger of extinction they will help survive. With the economy in trouble and with less room for zoos to house the increasing number of wild animals, zoo officials are forced to make these choices. At one time zoo animals lived […]
