The streak plate contains millions or billions of microscopic organism in it. These bacterial colonies are formed due to the inoculation of the bacteria on the petridish.
A single cell divides into two, ten these two cells divide to form four cells and so on. The whole colony of bacteria forms by the single cell.
The growth medium is prepared and pored on the petridish. After sometime when it is cooled down streaking is done for the growth of the bacteria.
yes it is dangerous
because that foot is discusting and could get you sick
i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.