| A | B |
|---|
| Ecosystem | All the living and nonliving things that interact in an area |
| Habitat | The place where an organism lives that provides needed things |
| Biotic Factors | The living parts of an ecosystem |
| Abiotic Factors | The nonliving parts of an ecosystem |
| Photosynthesis | Process in organisms that uses water, sunlight and CO2 to make food |
| Species | Similar organisms that can produce fertile offspring |
| Population | All the members of a species in an area |
| Community | All the different populations present in an area |
| Ecology | Study of how organisms interact with eachother and environment |
| Population Density | Number of individuals in a given area |
| Estimate | An approximation of a number based on good information |
| Birth Rate | Number of births in a population over a certain time |
| Death Rate | Number of deaths in a population over a certain time |
| Immigration | Moving into a population |
| Emigration | Leaving a population |
| Limiting Factor | Environmental factor that prevents a population from increasing |
| Carrying Capacity | The largest population that an environment can support |
| Natural Selection | Process where better-adapted organisms survive and reproduce |
| Adaptations | Characteristics that allow a species to live successfully |
| Niche | Role of an organism; how it makes its living |
| Competition | Struggle between organisms to survive in a habitat |
| Predator | Organism that kills others for food |
| Prey | Organism that is killed for food |
| Mutualism | Relationship in which both species benefit |
| Commensalism | Relationship in which one species benefits and the other is unaffected |
| Parasitism | When one species lives in or on another organism |
| Host | The organism that a parasite feeds off of |
| Producer | An organism that can make its own food |
| Consumer | An organism that gets its energy by feeding on other organisms |
| Herbivore | A consumer that eats only plants |
| Carnivore | A consumer that eats only animals |
| Omnivore | A consumer that eats both plants and animals |
| Decomposer | An organism that gets its energy by consuming wastes and dead organisms |
| Scavenger | Carnivore that feeds on previously killed organisms |
| Food Chain | A series of events in which one organism eats another and obtains energy |
| Food Web | Many overlapping Food Chains |
| Energy Pyramid | A diagram showing the amount of energy that moves from one feeding level to another |
