Small differences between parents and offspring accumulate over time. This process
A. results in only one type of organism that has the exact same characteristics as its ancestors.
B. prevents parents from being able to care for their offspring.
C. makes it impossible for species to adapt to changes in their environment.
D. results in many different types of organisms with different characteristics from their ancestors.

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.