| A | B |
|---|
| Reproduction | Process of producing offspring |
| Sexual Reproduction | Two cells joining to form a new one |
| Sex cells | Sperm and egg |
| Sperm | Sex cell produced by the male |
| Egg | Sex cell produced by a female |
| Testes | Male sex organ |
| Ovaries | Female sex organ |
| Fertilization | Uniting of the sperm and egg |
| Zygote | Fertilized egg |
| Mitosis | Cell division process |
| Embryo | Growing group of cells for two months following fertilization |
| 4-week embryo | Heart begins to beat |
| Fetus | Developing human from 8 weeks to birth |
| 4-month fetus | Mother begins to feel baby movement |
| Lanugo | Fine, downy hair covering the fetus |
| Normal pregnancy | 38 to 40 weeks |
| Types of reproduction | Asexual and sexual |
| When sex is determined | At moment of fertilization |
