| A | B |
|---|
| adaptation | a characteristic or structure that helps an organism survive |
| habitat | the place an organism lives |
| diversity | the variety of life on earth |
| species | a group with a number of like characteristics |
| variation | the difference within a species |
| zygote | two gametes coming together to form a fertilized egg |
| evolution | new species develop from previous ones |
| population | a group of one species in a certain habitat |
| natural selection | change over time, survival of the fittest |
| Charles Darwin | naturalist who came up with the theory of evolution |
| overproduction | too many offspring |
| limited resources | not enough food, water, and living space |
| advantage of some variations | some members of a population are better suited to survuve |
