Because they become older
D is the best answer honestly
I am not sure if this is a true or false statement, but if it is, I believe that the answer would be false. Few things are foolproof, and there are a few setbacks to gene testing as well that make it not foolproof. In most cases of genetic testing, there is no way to measure the accuracy of the test. In addition, the privacy of genetic testing may not actually be as private as you would like to believe. Finally, few genetic tests, including disease-prediction tests, give you any results that you can act upon; you can always take general precautions, but a genetic test will not tell you how to avoid getting a disease. Hope this helps.
Carbon is a essential element for all life on earth. The primary function of the the Carbon Cycle is to exchange carbon throughout earth between the atmosphere,oceans,ecosystems, and geosphere. If the Carbon Cycle was to fail, then life on earth would begin to breakdown causing an end to all life on earth.
Hope this helps :)