1. Which statement correctly describes a major defect of the student model in representing the
structure of a plant cell?
A А
It does not demonstrate the ability to grow and divide over time,
пе
B.
It does not demonstrate the ability to move in response to environmental stimuli,
C
It does not represent the organelles as being submerged in a fluid medium
D. It does not represent multiple types of structure as turning light into food,

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.

The sum of the oxidation numbers in a neutral compound is always

Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12