Using the data in this table, calculate the number of half-lives that have passed for the dike (unit D on this table) . 
Definitions:
Cellular Metabolism
The complex set of life-sustaining chemical reactions that take place within cells, involving the processing and energy conversion of nutrients.
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration, essential to the photosynthesis process in plants.
Oxygen
A chemical element vital to human respiration and the combustion process, symbolized as O.
Perfusion
The process of delivering blood to the tissues of the body, ensuring adequate oxygen and nutrient supply for cellular functions.
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