modern zoos are different from the old zoos of fifty years ago.in the old zoos people could see animals from many parts

modern zoos are different from the old zoos of fifty years ago.in the old zoos people could see animals from many parts of the world.the animals lived in cages.the zoo keepers took good care of them,but many of the animals did not feel well,and they often fell ill.
in modern zoos,people can see animals in more natural conditions.the animals are free in larger places.tree and grass grow in cages and water runs through the places.there is often a deep pool fillede with water.in an american zoo,visitors can see some small animals and many birds whenthey walk through a big special cage,and it is large enough for the birds to live naturally.
modern zoos not only show animals to visitors,but also keep and save rare animals.for this reason,people in the future will still ba able to enjoy watching these animals,.
where did the animals live in the old zoos?
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in the old zoos,the zoo keepers took good care of the animals,didn't they?
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in the american zoo,what can visitors see when they walk through the big special cage?
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what else do modern zoos do besides showing animals to visitors?
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which kind of zoo is better for animals,the modern one or the old one?why?
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