Monday Bell: Which of the following best supports Milankovitch's theory about ice ages? The increased level of carbon dioxide in the atmosphere during A the ice ages B The reduced level of sunlight intensity during the winter C The correspondence between the last four European ice ages and the low points on this radiation graph The reduced level of carbon dioxide in the atmosphere during the ice ages

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Group 15 elements

The elements of group 15 are phosphorus, nitrogen, bismuth antimony, and arsenic. The most abundant element which is present in the air is nitrogen and the percentage of nitrogen present in the air is 78%. In the free state, the elemental nitrogen is present as diatomic gas (N2). In the organic matter obtained from plants and animals, phosphorus is the dominant element present. In nucleic acids, phosphate groups are present. Phosphates are also found in teeth and bones. The other elements arsenic, bismuth, and antimony are found as sulfides. Arsenopyrite, bismuth glance, and stibnite are examples of sulfides of arsenic, bismuth, and antimony respectively.