A theory which is tested again and again and found to fit the facts and from the valid predictions may be made is then known as scientif ic law or priciples..
Because of the friction created between rising and falling material.
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Because deoxygenated blood has Carbon dioxide in it while oxygenated blood has oxygen due to which it has a bright red colour
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Optical instruments are based on optics. They use mirrors and lenses to reflect and refract light and form images. The light microscope and telescope use convex lenses and mirrors to make enlarged images of very tiny or distant objects. A camera uses a convex lens to make a reduced image of an object.
JJ Thomson added to Daltons theory by discovering the electron. He explained that the atom is a positive ball with negative electrons.