Diversity in organisms

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Across
  1. 4. dry scaly skin
  2. 7. connecting link between plants and animals
  3. 8. gastrovascular cavity is present
  4. 9. egg laying mammal
  5. 13. body is made up of repetitive units of rings
  6. 15. first successful terrestrial plants
Down
  1. 1. watervascular system
  2. 2. non flowering plants
  3. 3. cell wall made of peptidoglycan
  4. 5. reserve food is glycogen
  5. 6. presence of mammary glands
  6. 10. pollination occurs through insects
  7. 11. pouches mammal
  8. 12. contributed maximum oxygen level in atmosphere
  9. 14. pore bearing animals