What instruments or technologies might have helped determine whether some of the unknowns are living or not?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

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

Scientific evidence is most likely to be consistent if it is based on data from