3. The diversity of life in estuaries is incredible—birds, fish, marine mammals, shell-fish and other species all come here to live, feed and reproduce.
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They reproduce you because they need an offspring who will feed them when they become old and disabled.
他们生殖你因为他们需要在他们变老和无能的时候可以有人喂他们。
Even small viruses weighing one millionth of a single bacterium have the characteristics of life, for they feed on their surroundings, they grow and reproduce and they excrete by-products.
甚至细小的病毒，哪怕重量只有一个细菌的百分之一，也具有生命的特征，因为它们靠周围环境生活，会生长繁殖，而且会排泄副产品。
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