A) proton: positive charge
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<h2>Answer:</h2>
The correct answer is B. Matter.
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<h2>Explanation: </h2>
Matter is basically something that occupies physical space and has mass. It is every around us--atoms, compounds, etc. are all made up of it. There are three states of matter: solid, liquid and gas.
Answer:
The answer for writing 421,700 km in scientific notation is A
