Match the following terms and definitions.
a chemical that can destroy bacteria and other
microorganisms
cyanobacteria
2. single-celled photosynthetic bacteria
flagella
rickettsia
nitrogen fixation
3. whip-like cell extensions that give the cell motility
process by which certain bacteria in the soil convert nitrogen
gas into ammonia and ammonium
5. a disease-causing organism; a germ
disease-causing microorganism intermediate between
6. bacteria and viruses, carried in the tissue of arthropods
(insects, etc.)
pathogen
antibiotic

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.