If some animals reproduce so easily and quickly, why can’t we increase the numbers of endangered species like the giant panda just as easily? a. they have short lifespans and many offspring b. it is easy to do this, but no one has put in the c. they have more specific diets, fewer climates they can live in, or more difficult reproduction d. all of the above are true

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.