Answer:
A.
Explanation:
H2O is water. It has 2 hydrogen atoms and 1 oxygen atom, and that makes H2O which is water.
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It is a plant cell, because it is part of the plant, the rose, it is attached to.
The United States is the world's biggest oil consumer, followed by China, Japan and India.
As cells die, and reproduce from time to time, educational references show that every seven years, all cells have been replaced and considered as brand new. This also applies to the skeletal system. However, this statement is still not verified by health researchers.