What sense do animals use to migrate?

Hey me with this one❤☺❤ how do you say that a cell also has a life span and death like an organism? give one example.

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

Based on her survey, which advertising mediums will work best to publicize leslie's in-store specials?