Which scientist devised tests that helped confirm that bacteria and other microorganisms cause a variety of diseases?

What are the four basic classes of organic molecules how do they differ structurally and functionally

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 of the follow describes a disadvantage secondary sources have compared to primary sources?