English for biology

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Across
  1. 9. The upper layer of the Earth’s crust that supports plant growth.
  2. 10. A group of organisms capable of interbreeding and producing fertile offspring
  3. 12. A vertebrate that lives both on land and in water.
  4. 13. An animal with a backbone.
  5. 14. A flowering plant producing seeds enclosed in fruits.
  6. 17. A cold-blooded vertebrate with scaly skin, usually laying eggs.
  7. 18. Populations of different species living together in one habitat.
  8. 19. A group of similar cells working together to perform a specific function.
  9. 20. A structure made of several tissues performing a specialized task.
  10. 21. The amount of crop produced per unit of land area.
Down
  1. 1. An animal without a backbone.
  2. 2. A sequence showing how energy flows from producers to consumers.
  3. 3. All members of a species living in a specific area.
  4. 4. A natural or synthetic substance added to soil to supply nutrients for plants.
  5. 5. The process of collecting mature crops from the field.
  6. 6. A seed plant that produces naked seeds without flowers.
  7. 7. A community of living organisms interacting with their physical environment.
  8. 8. A step in the feeding hierarchy of an ecosystem.
  9. 11. The artificial application of water for crop production.
  10. 15. A warm-blooded vertebrate with hair and mammary glands.
  11. 16. Simple aquatic photosynthetic organisms.
  12. 18. The basic structural and functional unit of all living organisms.