Answer:
B. carbohydrate
carbs/carbohydrate is a form of sugar like cellulose
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The ocean acidification is generally caused by the vast amounts of carbon dioxide that humans release in the air gettting absorbed into the ground, causing the PH of the water to rise.
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Explanation:
option A is the correct one.
You should post the diagrams but basically there are more cells than tissues and more tissues than organs