| Term | Definition |
| Meiosis | Gamete formation |
| Fertilization | sperm & egg unite form zygote |
| Clevage | zygote undergoes mitosis produces new cells |
| Gastrulation | cells specialize into tissues |
| external fert | males and females gamete are released and fertilized in the Enviroment EX.Fishes |
| External fert with amplexus | male and femal embrace as gametes are released into environment EX. Frogs |
| Internal Fertilization | Male and Female release sperm packet which is placed inside female in various ways |
| Internal Fertilization with penis | gAmete placed directly into female EX males |
| Clevage | blastula |
| Gastrulation | 3 germ layers |
| ectoderm | skin and nervous system |
| mesoderm | bone and muscle |
| endoderm | organs |
| stem cells | cells before differentiation |