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