Word: multicellular
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...water glasses on the best dining tables. Paramecium, because of its size and fecundity (two generations a day), is a favorite subject for the study of unicellular life. Dr. Jennings, whose private laboratory is cluttered with his favorite "critters," believes they also provide important keys to the study of multicellular animals, such...
Infinitesimal Incest. These paramecium clones, which consist of the divisions and redivisions of one exconjugant (mated cell), are roughly comparable to the aggregate of cells in a multicellular animal like man. But, unlike the very different but interdependent cells in a human body, the cells in a clone are both identical and independent; they must struggle with each other to survive...
...naked cell lived in less optimal conditions than did the cell in a group. Through division of labor and coordination between cells, the external environment of the single-celled organism became the internal environment of the multicellular organism...
Next came the rise of the family as a biological unit. Natural selection no longer worked on the individual organism alone. "The population was the unit of selection, much as the population of cells composing the multicellular organism was selected as a coordinated unit...
...Stanley showed that a pure strain of virus could be crystallized-consisted of lifeless molecules with the curious, lifelike power of reproducing themselves. This discovery closed the mysterious gap between living and inert matter, indicated no essential distinction except relative complexity of structure between atom, molecule, virus, cell and multicellular organism such...