The illustration below shows a system that Shelby developed to classify different animals. Based on the information provided, which of the following bestdescribes how Shelby placed the animals into each category?A. Animals were classified according to their structural features. B.Animals were classified according to their behavioral features. C.Animals were classified according to their genetic relationships. D.Animals were classified according to the locations of their habitats

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.