Biology Crossword

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Across
  1. 5. A message that travels along a neuron
  2. 8. Reproduction involving two parents
  3. 9. The joining of sperm and egg cells
  4. 11. The body system that uses hormones to regulate functions
  5. 12. The structure that links the nervous and endocrine systems
  6. 15. An automatic response that happens without conscious thought
  7. 16. A process that stops hormone release when balance is reached
  8. 18. A nerve cell that carries information through the body
  9. 19. A chemical messenger released into the bloodstream
  10. 20. The organ that controls and coordinates body activities
Down
  1. 1. The process by which a seed begins to grow
  2. 2. The transfer of pollen to a female plant structure
  3. 3. Reproduction involving one parent and identical offspring
  4. 4. A plant structure that contains seeds
  5. 6. An organ that produces and releases chemicals or hormones
  6. 7. The spreading of seeds away from the parent plant
  7. 10. A unit of heredity that determines traits
  8. 13. The gap where a nerve impulse passes between neurons
  9. 14. A different form of the same gene
  10. 17. A characteristic passed from parent to offspring