Question

——– cannot be used as the unit of length for measrement​

Answer 1

$\huge\underline\mathtt{Answer}$

ml cannot be used as the unit of length for measrement

hope it will help you buddy

Answer 2

Answer:

$\fbox\blue{hey mate}$

Footsteps cannot be used as standard unit of length because its measurement varies from person to person which is not desirable. it will always give different measurement of length when measured fro different people.

so your answer is footsteps