The top documents tagged [systemkomponente tier]

- an essential trace element Basics What is selenium? discoverer: Berzelius (1817) occurrence in the earth‘s crust: 0.05 ppm nonmetal (chalcogen) close.

- an essential trace element Basics What is selenium? discoverer: Berzelius (1817) occurrence in the earth‘s crust: 0.05 ppm nonmetal (chalcogen) close.

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- an essential trace element

- an essential trace element

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