Enzymes in your body act as a catalyst. Thus the role of enzymes is to O inhibit chemical reactions
o increase the rate of chemical reactions
O help you breathe
decrease the rate of chemical reactions

Particles vibrate in a rigid structure and do not move relative to their neighbors.

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n

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.