Agood scientific theory is often

Which are forms of nitrogen that are usable by humans

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 number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give