Orginally the 'foot'of human being is taken as a unit of length. What condition prevents the use of human foot as a standard scientific fundamental (base) unit?

Orginally the 'foot'of human being is taken as a unit of length. What

1.	Orginally the 'foot'of human being is taken as a unit of length. What condition prevents the use of human foot as a standard scientific fundamental (base) unit?
Answer» SOLUTION :INVARIABILITY.