lunes, 19 de febrero de 2018
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1. The middle ages began in 476 with the fall of the Roman Empire and ended in 1492 with the Discovery of America. 2. In 711, th...
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1. Ecosystems are made up of three elements: the biotope, the biocenosis and the relationships between them. 2. The biotope is ...
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1. There are two characteristics that all living beings have in common: they are made of cells and they do three vital functions. ...
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