| A | B | 
| Chemosynthesis | Making organic compounds using energy released from chemicals | 
| Chlorophyll | Green pigments found in photosynthetic organisms | 
| Photosynthesis | The process by which organisms make organic compounds by using the energy in sunlight | 
| Cellular respiration | The process by which cells derive energy from organic compounds | 
| Producers | A photosynthetic or chemosynthetic organism that makes its own food | 
| Consumers | An organism that feeds on other organisms | 
| Herbivores | A consumer that eats plants | 
| Carnivores | A consumer that eats meat | 
| Omnivores | A consumer that eats both plants and animals | 
| Scavengers | An animal that feeds on dead organisms | 
| Decomposers | An organism that obtains energy and food from decaying organic matter | 
| Food Chain | The transfer of matter and energy from one organism to another | 
| Food Web | An interrelated group of food chains in a community | 
| Trophic level | A feeding level in a food chain | 
| Apex predators | The top predator in an ecosystem | 
| Biomass | The total amount of organic matter in an area | 
| Ecosystem | A community of interdependent organisms and their environment | 
| Adaptations | An inherited trait that helps an organism survive and reproduce | 
| Phytoplankton | Usually microscopic, photosynthetic organisms, mostly algae and diatoms, found in water | 
| Zooplankton | Usually microscopic, non-photosynthetic plankton consisting of animals and animal-like organisms |