HOW does the article develop the idea that
scientists have made progress treating viral illnesses?
by showing how many viruses there are, and explaining which diseases have vaccines
B
by explaining the origin of early vaccines, and describing how antivirals work
C by describing the characteristics of viruses, and explaining how they infect hosts
D
by providing an example of an early scientist,
and describing the role of antibiotics

Percent ionization for a weak acid (ha) is determined by the following formula: percent ionization=[ha] ionized[ha] initial×100%for strong acids, ionization is nearly complete (100%) at most concentrations. however, for weak acids, the percent ionization changes significantly with concentration. the more diluted the acid is, the greater percent ionization.a certain weak acid, ha, has a ka value of 9.4×10? 7.part acalculate the percent ionization of ha in a 0.10 m solution.part bcalculate the percent ionization of ha in a 0.010 m solution