| A | B |
|---|
| Spontaneous generation | The idea tht living things can come form nonliving things. |
| Trait | A characteristic of an organism. |
| Diversity | The range of differences among the individuals in a population. |
| Mitosis | The process that results in two cells identical to the parent cell. |
| Chromosome | A rod-shaped structure that contains DNA and is found in the nucleus of a cell. |
| Gamete | A sex cell, such as sperm or egg. |
| Meiosis | The process that results in sex cells. |
| External fertilization | The type of fertilization that occurs outside the female's body. |
| Internal fertilization | The type of fertilization tht occurs inside the female's body. |
| Embryo | An early stage in the development of an organism. |
| Cell differentiation | The process of cells taking on different jobs in the body. |
| Nymph | A young insect that loooks like the adult. |
| Marsupial | A mammal that gives birth to young that are very undeveloped. |
| Uterus | An organ in most female mammals that holds and protects an embryo. |
| Placenta | A tissue that provides the embryo with food and oxygen from its mother's body. |
| Gestation time | The period of development of a mammal, from fertilization until birth |
