Across
- 4. male gametes
- 5. a sperm joins with an egg in a reproductive process
- 6. is the amount of energy it takes to raise the temperature of 1 kg of water by 1 degree celsius
- 8. are basic units of the nervous system
- 12. human reproductive cells
- 13. The resistance to specific pathogens, or disease-causing agents
- 14. organ systems that work together and maintain steady internal conditions when external conditions change
- 17. is a type of white blood cell that is made in the thymus, the spleen, or tissue
Down
- 1. the cell that forms when a sperm cell fertilizes an egg cell
- 2. are the parts of food used by the body to grow and survive
- 3. is the process by which new organisms are produced
- 7. system organs that work together and perform specific tasks
- 9. female gametes
- 10. chemical released by the organs of the endocrine system
- 11. bone is the hard outer layer of tissue
- 15. bone is the interior region that contains many tiny holes
- 16. automatic movements in response to a signal