Completar Frases Introduction to Cells Versión en línea Introductory activity on cells. Fill in the blanks with the correct answer. por Francheli Bautista 1 membrane cells organelles nucleus All living organisms are composed of microscopic building blocks called . These cells have many different basic structures in common called . For example , cells are surrounded by a cell which controls the materials that move in and out of a cell . Another structure that most cells have in common is a in the center of the cell which contains the blueprints for the cells' growth and reproduction .
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