Question

difference between hand picking and winnowing

Answer 1

Hand-picking is the process when the undesirable component which differs from the desirable component in shape, size or colour is separated or picked up by hand .
Winnowing is the process of separating lighter components of a mixture from the heavier ones by using wind or moving air is known as winnowing.

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Answer 2

winning means piking with something handpiking means piking with hand