| A | B |
| Omnivores | Eat both producers and consumers |
| Tertiary Consumer | Feed mainly on secondary consumers |
| Energy | Flows in one direction and is not recycles |
| Matter | Moves between biotic and abiotic factors in the ecosystem and is recycled |
| Secondary Succession | Begins on soil |
| Primary Succession | Begins on newly exposed surfaces |
| Mutualism | Both species benefit from the relationship |
| Transpiration | Loss of water from a plant through its leaves |
| Food Web | All the interconnected feeding relationships |
| Competitive Exclusion Principle | No two species can occupy the same niche in the same habitat at the same time |
| Immigration | Movement of organisms into a given area from another area |
| Carrying Capacity | THe largest number of individuals that an environment can support |
| Density-Dependent Limiting Factors | Limiting factors that depend on population size |
| Exponential Growth | Growth pattern in which individuals reproduce at a constant rate |
| Logistic Growth | Growth pattern in which a population's growth rate slows or stops following a period of exponential growth |
| Eukaryotic Cells | Contain a nucleus |
| Prokaryotic Cells | Do not contain a nucleus |
| Diffusion | Movement of substances from an area that is more concentrated to area that is less concentrated |
| Hypertonic Solution | The cell shrinks because there is less water on the outside of the cell |
| Hypotonic Solution | The cell expands or burst because there is less water on the inside of the cell |
| Carbohydrates | Main source of energy for living things |
| Carbon | Has 4 electrons to share |