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Concentric circles on the sea floor near Japan, about 2 m (7 ft) in diameter with intricate ridged radial lines.........

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Concentric circles on the sea floor near Japan, about 2 m (7 ft) in diameter with intricate ridged radial lines and valleys of sand, are what?

posted Sep 8, 2020 by Brijesh Talwar

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Pufferfish mating attractions
Pufferfish are about 12 cm (5 ins) long, and create the displays over about 7 to 9 days. The circles were first observed by scientists near Japan in 1995.

answer Sep 9, 2020 by Madhavi Latha
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