Some people believe that the moon's phases are caused by earths shadows, is it true ?

When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

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