Classification of living organisms

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Across
  1. 3. Type of organisms that don't have cell wall and have to feed on other living organisms
  2. 9. A process where organisms multiply themselves
  3. 12. The type of cells that have membrane-bound organelles
  4. 13. Type of organisms that contain vacuole, chloroplast and cellulose cell wall
  5. 14. The type of animals that feed their youngs with milk and contain different types of teeth
  6. 16. A process where energy is released in cells
  7. 17. Group of organisms that can interbreed and produce fertile offspring
  8. 18. The type of plants that reproduce by spores and have leave-like structures called fronds
Down
  1. 1. Type of organisms that have cell wall but cannot photosynthesize, feed on dead things
  2. 2. the type of cells that don't have membrane-bound organelles
  3. 4. The type of flowering plants that have branching roots and parallel veins
  4. 5. The type of animals that have feathered wings and strong beaks
  5. 6. The group of animals that have a backbone
  6. 7. The type of animals that have scaly skins and lay rubbery eggs
  7. 8. The type of arthropods that have 3 pairs of legs and 2 pairs of wings
  8. 10. The type of arthropods that have more than 5 pairs of legs and gills, which allows them to live in water
  9. 11. The type of animals that contain jointed legs and exoskeleton
  10. 15. The type of flowering plants that have tap roots and branching veins