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assessment items

item 5

what is the stimulus shown in the photographs?

two images, one showing an open venus flytrap and the other showing venus flytrap with an insect captured in its jaws

the plant growing toward the light

the trap closing over the insect

the insect touching the trigger hairs

light coming from a single direction

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.