- How many animals in zoos are extinct in the wild?

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How is periodicity of properties depend upon number of protons in an atom? How is design an expression of the times? What is the sound level of a sound whose intensity is 7.3×10−6 W/m2 ?
PLEASE HELP QUICK? Potassium has a half-life of 12 hours. how long will it take for a quantity of potassium 42 to decay to 1/10 its original size? A boat takes 3 hours to travel 30 km down a river, then 5 hours to return. How fast is the river flowing?