- adaptations: changes organisms make to survive
- community: the group of populations in an area
- decomposer: an organism that breaks down other organisms
- ecosystem: the interaction of a community of organisms with their physical environment
- 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
- mutation: a change caused by genes in an organism
- natural selection: a process of many changes over time that help an organism or species to survive
- niche: the job an organism has in an ecosystem
- offspring: a parent's child
- photosynthesis: process a plant uses to change sunlight into energy