What is the significance of type O blood versus type AB blood?

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

What is the difference between a scientific hypotheses and a scientific theory?

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different