Why is it necessary to perform repeated investigations in order to test a hypothesis?

Mbd science refresher for 9 class? What happens if you use too much paper towels? What is differences between major diffects and minor diffects in garments? What are the different physical separation process in separating mixtures? Can solutions only be made with liquid solvents? What is the difference between a simple and deferential stain? How many pounds equal 200 troy ounces? The first step in releasing the energy of glucose in the cell is known as? How can you map the field around a magnetic nail? How many miles are in 50 meters? What causes the so-called fly away hair effect of electrostatics? How did Lamarck's ideas differ from Darwin's? Does a experiment test a theory? A collection of hypotheses that have been repeatedly tested and are supported by a great deal of evidence is called a prediction? Is homogenized milk a compound or heterogenous? What is the difference between illuminated objects and non-luminous objects? Models help ecologisits control the many variables in their studies? What is rain an example of? What are the things a scientist does? Explain Why physical changes can be reversed but chemical changes cannot?