he failed to classify it as animal.
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1.It makes it easier to find and study them.2.Not everyone would classify the same way.
By its contents. There is fiction and nonfiction. There is crime, fantazy, children stories and other categories.
One view The Earth can be classified as a habitable planet (and it is the only one we presently know of). Another view A rocky planet characterised by the presence of liquid water and a chemically...