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LESSON 1. CELLS & TISSUES THE CELL - ACS

CELLS & TISSUES Lesson Aim To explain the human body at a microscopic level, including the structure and function of cells, tissues and membranes. THE CELL All living matter is composed of functional units called cells. At one end of the scal e in the animal kingdom, there are unicellular organisms composed of a single cell (eg. Protozoa or ...