Question

What is cork?
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Please give appropriate answer.

Answer 1

Cork is an impermeable buoyant material, the phellem layer of bark tissue that is harvested for commercial use primarily from Quercus suber, which is endemic to southwest Europe and northwest Africa. 
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Answer 2

cork is small wood of a tree with less density
Robert hook first found cell from a cork piece with the microscrope made by himself​