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From generation to generation the chemical structure of the cells and the amount of DNA present in similar ones have been painstakingly measured and it has been established that no change takes place. |
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Careful measurements have established the fact that both the chemical structure and the quantity of DNA in many of these cells remain unchanged from one generation to the next. |
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Meticulous measurement techniques have been used to establish that the chemical structure of the cells and the amount of DNA in each remains unchanged from one generation to the next. |
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Careful measurements have shown that both the chemical structure and the amount of DNA in similar kinds of cells remain the same from generation to generation. |
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Meticulous measurements have been taken of the structure and the quantity of DNA in given cells, and it has been finally established that no change takes place from generation to generation. |