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The natural environment or natural world encompasses all living and non-living things occurring naturally, meaning in this case not artificial. ... This environment encompasses the interaction of all living species, climate, weather and natural resources

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People seldom find absolutely natural environments on Earth, and naturalness usually varies in a continuum, from 100% natural in one extreme to 0% natural in the other. More precisely, we can consider the different aspects or components of an environment, and see that their degree of naturalness is not uniform.

The multicellular eukaryotic species known as animals, animals, fauna, wildlife, or animals comprise the biological kingdom Animalia.

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The multicellular eukaryotic species known as animals, animals, fauna, wildlife, or animals comprise the biological kingdom Animalia.  Animals, with very few exceptions, are able to move, reproduce sexually, eat organic materials, breathe oxygen, and evolve from a hollow ball of cells called a blastula during the embryonic stage of development.  A total of more than 7 million animal species are thought to exist, while more over 1.5 million living animal species—of which roughly 1 million are insects—have been described.

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