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Sure, yes.
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Germ germ fruit. Ability to shrink to any size all the way down to a bacteria cell.
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Ohh, that could be awesome. My only real fear would be extreme temperatures or some chemical compounds. Though would a bloodstream count as water? It has a lot more solutes in it than seawater.
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Your not becoming a cell your shrinking down to one. So your safe unless you get hit by rain or venture into a human body and land into their saliva. Then you would be burning and drowning!