Living Things in the Biosphere

123456789101112131415161718192021
Across
  1. 4. A substance used in a vaccination that consists of pathogens that have been weakened or killed but can still trigger the body to produce chemicals that destroy the pathogens.
  2. 9. A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce.
  3. 11. The process of grouping things based on their similarities.
  4. 12. The scientific study of how living things are classified.
  5. 13. A living thing.
  6. 15. Consisting of many cells.
  7. 16. The process by which unrelated organisms evolve similar characteristics.
  8. 17. The mistaken idea that living things arise from nonliving sources.
  9. 18. Made of a single cell.
  10. 19. A taxonomic category that names a group of similar, closely-related organisms.
  11. 21. An action or change in behavior that occurs as a result of a stimulus.
Down
  1. 1. Change over time; the process by which modern organisms have descended from ancient organisms.
  2. 2. A tiny, nonliving particle that enters and then reproduces inside a living cell.
  3. 3. The condition in which an organism's internal environment is kept stable in spite of changes in the external environment.
  4. 5. Single-celled organisms that lack a nucleus; prokaryotes.
  5. 6. A eukaryotic organism that cannot be classified as an animal, plant, or fungus.
  6. 7. An organism that benefits by living with, on, or in a host in a parasitism interaction.
  7. 8. The basic unit of structure and function in living things.
  8. 10. The classification system in which each organism is given a unique, two-part scientific name indicating its genus and species.
  9. 14. The most basic level of organization in the classification of organisms.
  10. 17. Any change or signal in the environment that can make an organism react in some way.
  11. 20. An organism that provides a source of energy or a suitable environment for a parasite to live with, in, or on.