| A | B |
|---|
| adolescence | time in life between childhood and adulthood |
| hormones | chemical substances which help regulate the way your body functions |
| endocrine system | glands throughout your body that regulate body functions |
| reproductive system | body organs and structures that make possible the production of offspring |
| semen | mixture of sperm and fluids |
| fertilization | joining of the male sperm cell and a femal egg cell to form a new life |
| cell | basic unit of life |
| body system | group of organs working together to carry out related tasks |
| infancy | first year of a baby's life |
| uterus | pear-shaped organ in which a developing child is nourished |
