Biology week

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Across
  1. 2. Substance that stimulates immunity to a disease
  2. 4. Single-celled organisms without a nucleus
  3. 6. Molecule that carries genetic instructions
  4. 10. A community of organisms and their environment
  5. 11. A living thing
  6. 12. Change in a species over time
  7. 14. Unit of heredity passed from parent to offspring
  8. 15. The process by which plants make food using sunlight
  9. 16. Organelle that produces energy in the cell
  10. 19. Division process that results in two identical daughter cells
  11. 20. Small structure within a cell with a specific function
  12. 21. A variant form of a gene
Down
  1. 1. Basic unit of life
  2. 3. Green pigment used in photosynthesis
  3. 5. Process by which an organism becomes better suited to its environment
  4. 7. Chemical messenger in the body
  5. 8. Organelle that contains the cell's DNA
  6. 9. Molecule made of amino acids
  7. 13. A protein that speeds up chemical reactions
  8. 17. Long-term weather patterns in a region
  9. 18. Group of similar organisms that can breed and produce fertile offspring