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For example, the half-life of a radioactive substance is the amount of time it takes for half of its atoms to decay, and the half-life of a drug is the amount of time it takes before half of the active elements are either eliminated or broken down by the body.

Highly polluted areas, such as the Los Angeles area, pose a threat to the elderly, children, and people suffering with COPD (Chronic Obstructive Pulmonary Disease) (“People at Risk,” 2013)., we find that this ration is the same if we sample a leaf from a tree, or a part of your body.Think of it like a teaspoon of cocoa mixed into a cake dough—after a while, the ‘ratio’ of cocoa to flour particles would be roughly the same no matter which part of the cake you sampled.- Without carbon dioxide plants cannot photosynthesize.Through reading various books and web pages it was made clear that carbon dioxide is definitely one of the raw materials needed for photosynthesis, but I wanted to see whether this is actually true and if carbon dioxide is taken away completely will the plant photosynthesize at all.