You are viewing a blood vessel under the microscope. You see three distinct layers, one of which is a thick muscular layer. The layers are separated by extensive elastic tissue. What is this vessel most likely to be

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for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .