When ice covers lakes, there is less oxygen to breathe, and most fish sink to the bottom. They remain very quiet but awake. Carp, however, flap their tails to cover themselves with mud and they go to sleep. When the lake ice melts and the oxygen levels rise they awaken.
Magic sponge
Magic sponge Researchers have found that some species of
Caribbean marine sponges manufacture their own antibiotics. Some of
these are actually found to be more powerful than commercially
produced antibiotics. 6 NOVEMBER 1999, P. 27
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