When a bacterial infection is treated with an antibiotic, the hope is that the antibiotic will kill all of the bacteria and prevent them from reproducing. however, if the full prescription of antibiotics is not taken by the sick person, some of the more resistant bacteria can survive. when they reproduce, these bacteria can pass the genes responsible for their resistance on to their offspring. as a result, subsequent administration of the same antibiotic will be less and less effective over time.

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Which of these is most likely to happen if parallax measurements of star distances are taken after a gap of six months? the results would be accurate the results would be inconsistent the results would not be valid the results would not be repeated

This is the main structural axis of the plant that supports leaves, flowers and fruits; transports fluids; stores nutrients and produces new tissue.