Which item is a carbon sink and not part of the carbon cycle? carbon found within limestone rocks carbon in the atmosphere in the form of carbon dioxide carbon dioxide being converted into carbohydrates during photosynthesis consumers breaking down carbohydrates into carbon dioxide during respiration?

According to the article, what valid claim came from the national research council? there is no association between fluoride exposure and increased cancer risk in humans. there is a possible link between fluoride exposure and increased cancer risk in humans. there is a definite link between fluoride exposure and increased cancer risk in humans.