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BIOLOGY EE / WORLD STUDIES EE

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Hi there, I am struggling to come up with a topic for my extended essay. I have a marine aquarium and I really wanted to do it on something relating to that. I am currently thinking that maybe a biology one about the symbiotic relationship between coral and zooxanthellae bacteria but am unsure how to word the question. Also thought maybe a world studies on chemistry and ESS about the relationship between calcium and alkalinity (they precipitate each other) and how this effects reef formations. I am open to ANY suggestions whatsoever so please don't hesitate to throw any ideas at me! thanks so much guys!

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