Classification of living things

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Across
  1. 5. unicellular organism with a cell wall but no nucleus
  2. 10. membrane bound structure found in cells that contains most of the cell's genetic material
  3. 11. scientist who classifies living things into groups
  4. 13. organisms with an exoskeleton or no skeleton at all
  5. 15. organisms with an endoskeleton (internal skeleton)
  6. 16. key a method of identifying the species using questions that lead to further questions and eventually to name a species
  7. 19. internal skeleton
  8. 20. organism with a constant body tmeperature
  9. 22. living things consisting of only one cell (e.g. bacteria)
  10. 23. group of organisms that look similar to each other, can breed in natural conditions and produce fertile young
  11. 24. taxonomy system of classification first developed by Carl Linnaeaus (1707-1788) in which all kingdoms are grouped into five kingdoms
Down
  1. 1. name double name system created by Linnaeus to name organisms; the first name is the genus, the second name is the species
  2. 2. type of single celled organism belonging to the protista kingdom
  3. 3. organism that makes its own food
  4. 4. microscopic organisms that float in fresh or salt water
  5. 6. a group of closely related organisms
  6. 7. external skeleton
  7. 8. organism that has more than one cell
  8. 9. key diagram used in classification; each 'arm' of the key contains two choices
  9. 12. organisms (e.g. fungi) that need to absorb their nutrients from other living things
  10. 14. tissue in a plant, tube-like structures that transports water from the roots to the leaves
  11. 17. organism with a body temperature that changes with the environment
  12. 18. (biology) visual tool used in classification of organisms
  13. 21. wall a structure that provides support around some cells