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“I took a good clear piece of Cork and with a Pen-Knife sharpen’d as keen as a razor . . . cut off . . . an exceeding thin piece of it. For upon examination with my Microscope, I could exceedingly plainly perceive it to be all One method of determining the classification of an animal is by perforated and porous . . . These pores, or cells, were not very deep, but consisted of a great many little Boxes. ”These words were written by Robert Hooke in 1665. The pores or cells that Hooke described were really —
What is cell wall?