In order to determine which antibiotic might treat an infection most effectively, a plate is inoculated with a pathogen. A variety of paper disks, each containing a known amount of antibiotic, are placed on the surface of the plate. After incubation, the plates are examined for zones of inhibition. Which type of test is this

As a result of these processes the single celled organism accomplishes

Whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.

Glands that the body deal with stress and respond to emergencies.