What is the copying process by which a cell duplicates it’s dna

The cluster of developing cells from conception until birth is called an

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

Which label correctly identifies what x represents in the concept map?