An original sample of the radioisotope fluorine-21 had a mass of 80. 0 milligrams. Only 20. 0 milligrams of this original sample remain unchanged after 8. 32 seconds. What is the half-life of fluorine-21?.

Which early modernism trend in art focused on prehistoric or exotic cultures? a. primitivism b. expressionism c. impressionism d. total serialism

What is a financial award that is based on academic or extracurricular merit? -loan -scholarship -work study -federal grant

Abacterium was found to contain a sequence of atcgggatcct in its genome. a few generations later, the sequence was found to be atcatcct. what type of mutation caused this change in the bacteria? a. duplication b. insertion c. inversion d. translocation