The picture shown depicts many microscopic organisms that can live in extreme environments such as hot springs and hydrothermal vents. These are organisms with no nucleus that can be found in extreme environments. What kingdom do these
organisms belong to?
a
Archaebacteria
b
Protists
c
Fungi
d
Animalia

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.