Image of organisms in turtle pond water

This is an image of turtle pond water sample under foldscope. The turtle pond water was provided by section TA’s. Two drops of pond water were placed on the load glass with a cover. The picture was taken by a phone camera. Question: Is this a bubble or an organism? How to distinguish them? Potential approach: Observe for a longer time and see if it moves, not in a manner of Brownian motion.

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