Question

How do tadpoles originate in an enclosed pond with no available parent?

Answer 1

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Their eggs will hatch after just a few days, the tiny new tadpoles wriggling out of the egg jelly to spend the summer eating detritus at the bottom of the pond. 

Answer 2

Their eggs will hatch after just a few days, the tiny new tadpoles wriggling out of the egg jelly to spend the summer eating detritus at the bottom of the pond.