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Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.