| A | B |
| Population | Any group of the same species that occupies a specific area at the same time |
| Producer | Able to make their own food |
| Fossil Fuel | Burning these increase the amount of carbon dioxide |
| Ecosystem | a community or organism interacting with each other in their environment |
| Water cycle | Parts include evaporation, condensation and rain |
| Community | all of the populations that live together in the same space and interact together |
| Niche | specific role played by an organism within its community |
| Habitat | particular place in which an organism lives |
| Symbiosis | two or more species living together in a habitat |
| Food Web | All possible feeding relationships in an ecosystem |
| Recycling | water elements and nutrients being used more that once |
| Mutualism | two species living in a habitat where both species benefit from one another |
| limiting factor | any condition that influences the growth or survival of an organism |
| competition | when two organisms try to fill the same niche |
| Parasitism | two species living in a habitat where one benefits and one is harmed |
| Commensalism | two species living in a habitat where one benefits and one is not harmed |
| Predators | animals that can catch and eat other animals |
| Decomposers | organism that gets food by breaking down dead organisms into nutrients |
| Food Chain | a single line of intraction that show energy in an ecosystem |
| Extincition | the disappearance of species |