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The first is (D), the second is also (D)
Answer:
b is the correct answer i guess
The elodea is getting the carbon dioxide from its environment like when underwater animals breathe out carbon dioxide the plants will use that carbon dioxide. The plants can also get the carbon dioxide from the atmosphere which can "dissolve" in water.
I think it be D.But if that ever happen I'm sure that the scientists will find away to stop it