Living Things in the Biosphere

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