| A | B |
|---|
| initiative | doing something without being asked |
| heredity | traits such as hair color and eye color result from this. |
| behavior | the factor of your life that you have the most control over |
| hormones | chemicals that cause the changes in your body that prepare you for adulthood |
| fertilization | joining of the egg and sperm cells |
| infancy | the stage when children learn to sit, crawl, and stand |
| tissues | groups of similar cells that do the same jobs |
| organs | the liver and heart are types of these |
| environment | your values and thinking are most affected by your... |
| puberty | when you acquire the physical traits of the adults of your sex(gender) |
