Living things

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Across
  1. 4. An animal that produces milk to feed its own young.
  2. 5. I swim, I lay eggs, I have scaly skin, and a hard shell. Who am I?
  3. 7. The largest class of animals on earth.
  4. 10. Another name for the "backbone".
  5. 11. Most plants use this to make their own food.
  6. 13. Animals that have a backbone.
  7. 14. The way our cells release the energy from food.
  8. 16. Most plants have a chemical this colour so that they can make their own food.
  9. 17. Food is a source of this.
  10. 19. A mammal that can fly.
  11. 20. Tough animals that lay eggs, but can have trouble keeping themselves warm.
Down
  1. 1. All living things are composed of these small units
  2. 2. How green plants make their own food.
  3. 3. Most plants do this much more slowly than animals
  4. 4. Microorganisms can only be seen one of these.
  5. 6. Living things.
  6. 8. The surroundings of an organism
  7. 9. These animals have gills for breathing.
  8. 12. A guide you might use to identify a plant or animal.
  9. 15. The way that living things get rid of waste products from their bodies.
  10. 18. What organisms do when there is a change in their environment.