A 100.0 g sample of Co-60 decays until only 12.5 g of it remains. Given
that the half-life of Co-60 is 5.271 years, how long did the decay take?

I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.

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The answer would be true