The cell theroy is made up of three main ideas: 1. All organisms are composed of one or more cells. An organism may be a single cell, such as the organisms Van Leewenhoek saw in water. Others, like most of the plants and animals with which you are most familiar, are multicellular, or made up of cells. 2. The cell is the basic unit of organization of organisms. Although organisms can become very large and complex, such …showed first 75 words of 285 total…

…showed last 75 words of 285 total…and descriptions, which encouraged other scientist to search for cells in the materials they were studing. Several scientist extended Hooke's observations and drew some important conclusions. In the 1830s, the German scientist Matthias Schleiden observed a variety of plants and concluded that all plants are composed of cells. Another German scientist Theodore Schwann, made similar observations and conclusions of theses scientists are summerized as the cell theory, one of the fundamental ideas of modern biology.