D. Oxygen and metal
They usually contain some form of metallic cation, given that carbonates are the most distributed minerals in the Earth's crust.
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I'm not sure what you mean by "compartments", but the cardiovascular system consists of the heart, blood vessels, and approximately 5 liters of blood.
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B represents the growth shown in plants without fertilizer even in similar conditions. Experiment B is important because it helps bring the experiment to a conclusion that plants react better with fertilizer when growing in it’s early stages.