Unit 3 LS Classifying Animals

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Across
  1. 3. A gas-filled organ that allows a bony fish to move up and down in water.
  2. 5. A class of arthropods that includes spiders, scorpions, mites, and ticks.
  3. 6. The process by which an arthropod sheds its external skeleton.
  4. 7. A group of living things that includes separate species.
  5. 9. An arrangement of body parts that resemble the arrangement of spokes on a wheel.
  6. 11. A body that consists of left and right halves that are the same.
  7. 12. Group things based on the features they share.
  8. 14. A soft material found in vertebrate skeletons.
  9. 17. An egg-laying vertebrate that breathes with lungs.
  10. 18. A worm whose body is divided into sections, such as earthworms or leeches.
  11. 20. Subdivision of a kingdom (plural is phyla).
  12. 21. Having a body temperature that changes with temperature and surroundings.
  13. 22. A worm with a smooth, round body and pointed ends.
  14. 23. The name given to each species, consisting of its genus and its species label.
  15. 24. A stage in the development of some insects that leads to the adult stage.
  16. 27. A group of organisms that can breed with each other to produce offspring like themselves.
  17. 29. A class of arthropods that includes crabs, lobsters, crayfish, and sow bugs.
  18. 31. A major change in form that occurs as some animals develop into adults.
  19. 32. An animal that does not have a backbone.
  20. 33. A small structure used by echinoderms for movement.
Down
  1. 1. A milk-producing structure on the chest or abdomen of a mammal.
  2. 2. Changes in form during development in which earlier stages look like the adult.
  3. 4. An armlike body part in invertebrates that is used for capturing prey.
  4. 8. A structure used by some animals to breathe in water.
  5. 10. A simple worm that is flat and thin.
  6. 13. A member of the largest group of invertebrates, which includes insects.
  7. 15. Changes in form during development in which earlier stages do not look like the adult.
  8. 16. One of the bones or blocks of cartilage that makes up a backbone.
  9. 19. An invertebrate divided into three parts.
  10. 25. Having a body temperature that stays the same.
  11. 26. An animal with a backbone.
  12. 28. An invertebrate animal that includes jellyfish, corals, and hydras.
  13. 30. A vertebrate that lives at first in water and then on land.