Aboy is walking down the road with a doctor. while
the boy is the doctor's son, the doctor is not the
boy's father. then who is the doctor?

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters