Question

give sintific resaons it is not proper to measure quantities by using body parts as units​

Answer 1

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it is not proper to measure quantities by using body parts as units because these are not reliable and unique. These units of measurement vary from person to person.

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Answer 2

Answer:

It is not proper to measure quantities by using body parts as units because these are not reliable and unique. ... So, it becomes necessary to get the weights and measures standardized at regular intervals.