A group of tissue that work together is a organ
It couldn't be analysed chemically because it's chemical composition is to complex. It would be hard for us to analyse them because once it has been removed from the organism, it ends as protoplasm only.
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Las células eucariotas tienen dos funciones primordiales, alimentarse y reproducirse. Las células eucariotas, al igual que las procariotas, llevan a cabo tres funciones esenciales: la nutrición, la relación con el medio y la reproducción. ... Célula con un núcleo definido por una membrana que contiene el material genético.
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I learned about this in bio last year, maybe I can help
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Linnaeus' system, organisms are grouped together and organized into seven types of categories. The categories are based upon structural characteristics shared by the organisms. They are, from largest to smallest – kingdom, phylum, class, order, family, genus, species.