Cuvier, lamarck, and erasmus darwin all shared an idea of evolution. however, what key feature did their ideas all lack, which charles darwin would later develop?

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to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)