| mutation | a change caused by genes in an organism |
| offspring | a parent's child |
| adaptations | changes organisms make to survive |
| natural selection | a process of many changes over time that help an organism or species to survive |
| community | the group of populations in an area |
| ecosystem | all living things and nonliving things in an area |
| energy pyramid | a diagram showing the flow of energy through a food chain |
| habitat | the place in an ecosystem where an organism lives |
| niche | the job an organism has in an ecosystem |
| decomposer | an organism that breaks down other organisms |
| photosynthesis | process a plant uses to change sunlight into energy |
| ecosystem | the interaction of a community of organisms with their physical environment |