I need a good 11th grade level science experiment?

I'm in the 11th grade and need a good science experiment topic. I need a topic that is a little more challenging considering i've been doing experiments for science fairs for years now. I'm mostly interested in Biology and microbiology, but i'm open to any other areas. I've tried searching the internet for ideas but none really jumped out at me. Any way you can help is greatly appreciated!

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