1. B. A process in which electrons are transferred from one compound to another with a release of energy occurring in the production of ATP
2. A. The gel-like material within a living cell
3. D. An organic molecule that occurs as an intermediate in many metabolic processes
4. C. The chemical breakdown of a substance
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Fat, Cholesterol, Heart Attacks/Strokes
Answer: 1.251 billion years
Explanation: The half-life of potassium 40 is 1.251*10^9 years. Since in the igneous rock there is one half of potassium left it means only one half-life has passed.