Leaves of three let it be

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Across
  1. 1. - A condition where the skin becomes red, swollen, or sore.
  2. 4. - A naturally occurring compound containing nitrogen.
  3. 6. - Trees or plants that shed their leaves annually.
  4. 7. - The process by which green plants use sunlight to synthesize foods.
  5. 9. - The scientific study of plants.
  6. 11. - Interaction between two different organisms living in close physical association.
  7. 13. - The arrangement of veins in a leaf.
  8. 14. - Sensitivity of an organism to light.
  9. 16. - The stalk that joins a leaf to a stem.
  10. 18. Ivy - A plant known for its trifoliate leaves and irritant oil.
  11. 19. Leaf - A type of leaf divided into several leaflets.
  12. 20. - The leaves of a plant.
Down
  1. 2. - The process of change by which an organism becomes better suited to its environment.
  2. 3. - The layer of vegetation beneath the forest canopy.
  3. 5. - A reproductive cell that can develop into a new individual.
  4. 8. - The green pigment in plants that helps in photosynthesis.
  5. 10. - Having three leaves or leaflets.
  6. 12. - The natural home or environment of an organism.
  7. 15. - The genus that includes poison ivy, oak, and sumac.
  8. 17. - The study of interactions between organisms and their environment.