Which is longer?
A.1 mile or 1 kilometer
B. 1 yard or 1 meter
(. 1 inch Or 1 centimeter

Kilometers (km) are larger than centimeters (cm), so you expect there to be less than one km in a cm. Cm is 10 times smaller than a dm; a dm is 10 times smaller than a m, etc. Since you are going from a smaller unit to a larger unit, divide. ... 1 centimeter (cm) = 0.00001 kilometers (km).

1 inch would be longer then 1 centimeter

It might. it might because if you think about if they discovered if we came from (lets say something funny like aliens) and thy found cells that matched and they would have t do more research about it but would most probably change their theory.