General characteristics of living organisms

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Across
  1. 3. The substance responsible for absorbing light energy in plants
  2. 5. Blood vessels that lead to the heart, most of which carry blood loaded with harmful waste products and CO₂
  3. 7. Specialized cells that control the opening and closing of stomata in plant leaves
  4. 8. Living organisms that depend on others for obtaining food.
  5. 10. Natural openings in plant leaves for gases to enter and exit
  6. 11. Structures in insects through which oxygen is obtained from the air
  7. 12. A type of living organisms that breathe through their lungs and skin
  8. 13. A process in which living organisms obtain energy and produce substances that they use to build their bodies
Down
  1. 1. Tissue that transports food from the leaves to the rest of the plant
  2. 2. A process in which plants obtain carbon dioxide and release oxygen
  3. 4. The substance that plants make as food and from which they obtain energy
  4. 6. Living organisms that can make their own food through photosynthesis
  5. 9. The process by which living organisms obtain oxygen and release carbon dioxide