The plants in the aquatic environment take in carbon dioxide and release oxygen. The animals however, are the opposite as they release carbon dioxide and take in oxygen. Therefore, both the plants and animals work as a team and "trade" the nutrients they need to survive. This process changes the water levels due to the "pumping" of water in the cycle to recycle the nutrients. The temperature varies as well which also contributes to the change in water levels.
So there is the oxygen and carbon dioxide cycle and Shark Biscuit and I agree that I keep getting the boring and serious topics so I hope SOMEONE that assigns these could do a challenging topic tomorrow please? Haha!
-Turtle Rooter
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