<span> It is the amount of matter in the object. hope this helps
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Prehistory is the time before history.
History is usually defined as the time in the past BEFORE written (or similar) solid evidence, for which we can only infer what happened.
So the correct answer is C.
The pH scale is used to measure how acidic or alkaline something is.
Hope that helped you!
BRAINLIEST??
Answer:
The empirical and molecular formula because the ratio is 2:1 <em>and </em>there is 2 hydrogen atoms and 1 oxygen atom.
Hope this helps!