The astronomical unit or also know as AU. Scientists use this because it’s convenient and easier to understand! Hope this helps ;)
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d) They're studying something for which they cant do an experiment
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<em>Nuclear power releases less radiation into the environment than any other major energy source.</em>
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Compound consist of molecules that are identical, this molecules are made up of atoms of two or more elements. An element is identified based on the atomic property of the element. Water as a compound is composed of 2 Hydrogen atom to 1 oxygen atom and the molecule is H2O.
