Where in the cell does most of the activity occur during mitosis

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

How does the color of light affect the germination time (amount time a plant takes to develop) of a radish seed?

Which correctly describes crossing over ?