The distance of the mid-point of the line -segment joining the points (6,8) and (2, 4) from the point (1, 2) is
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The cell was first discovered by Robert Hooke in 1665, which can be found to be described in his book Micrographia. In this book, he gave 60 'observations' in detail of various objects under a coarse, compound microscope. ... Hooke discovered a multitude of tiny pores that he named "cells".
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(3 and 5) is the correct one
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