The half-life of a radioactive element is defined as the time that it takes for one-half a quantity of the element to decay. Radioactive carbon-14 is found in all living organisms and has a half-life of 5730 years. Consider a living organism with an original concentration of carbon-14 of 100 grams. a. If the organism lived 5730 years ago, what is the concentration of carbon-14 today? b. If the organism lived 11,460 years ago, determine the concentration of carbon-14 today. and then​