Across
- 4. The single cell formed by the fusion of sperm and egg at the start of human development.
- 5. The thing is 10.5 cm at birth, 16.5 cm at 1 year of age and 17.5 cm at 5 years of age
- 7. The developmental period before birth, beginning with fertilization and ending at delivery.
- 8. The process of structural and functional change that occurs over time in an individual.
- 9. The first teeth begin to appear in certain months after birth and are completed around the age of 2-3.
- 11. A developmental period marked by puberty and rapid physical, emotional, and hormonal changes.
Down
- 1. The process of bone formation by mineralization of cartilage or connective tissue.
- 2. Soft spots on a baby’s skull where the bones haven’t fused yet.
- 3. The developmental stage from the ninth week of pregnancy until birth.
- 6. The fusion of male and female gametes to form a zygote.
- 10. The outer germ layer that develops into skin, hair, nails, and the nervous system.