I need help asap:):):):)

What is thought to have caused the mass extinction at the end of the cretaceous period?

Plz ! ive been stuck on this forever

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