1.   Bacteria can form spores, a tough, hunkered down form in which most metabolism stops.

2.   Bacteria form in the mouths of toothless infants and cause the same sort of foul breath with which many adults wake up.

3.   Good, crumbly soil is made out of aggregates of sand, silt and clay particles held together by the gums and gels formed by bacteria.

4.   Good, crumbly soil is made out of sand, silt and clay particles held together by the gums and gels formed by bacteria.

5.   PAHs are found on Earth in fossil sediments, where they are formed by bacteria.

6.   Some lichens and bacteria have colonized spaces between protective layers of sandstone, and bacteria have formed dense mats at the bottom of ice-covered lakes.

7.   To protect themselves from severe stresses, some bacteria form spores, armored capsules that are more or less immune to hostile environments.

8.   When not actively infecting people or sheep or other creatures, the bacterium forms a hard-shelled spore and goes into hibernation.

9.   While the bacteria can form on fish anywhere, researchers found that the crowded conditions of fish farms make for ideal breeding grounds.