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Gambusia

Gambusia affinis holbrookii – viviparous small fishes who treat the Poeciliidae family, group of karpozuby; artificially part for fight against larvae of malarial mosquitoes.

 
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Was considered earlier that yawning enriches an organism with oxygen. However this opinion was disproved. Scientists proved that yawning, the person cools a brain and improves its working capacity.