| Term | Definition |
| intestines | Bacteria live in our _____________ and produce Vitamin K. |
| plants/animals | Bacteria break down dead _________ and ___________. (decomposers) |
| oil spills | Bacteria can be used to clean up _____ ________. |
| nitrogen | Bacteria change ___________ from air to forms that plants can use. |
| Respiration | organisms use oxygen to get energy from food, some of which is released as heat. |
| Oxygen + glucose
(Raw products) | carbon dioxide + water + energy (heat)
(Products) |
| cellular respiration | All organisms must carry out ________ ___________ to perform its functions to survive. |
| sun | The _______ supplies the energy for most life on Earth. |
| Producers | make their own food
(photosynthesis; plants) |
| producers | All food chains and food webs start with ___________. |
| consumers | must eat other consumers (meat eaters) |
| herbivores | eat plants |
| carnivores | eat other consumers (plants and animals) |
| decomposers | break down dead organisms |
| scavengers | eat dead organisms |
| food chain | a model, a simple way of showing how energy passes from one organism to another |
| food web | is a series of overlapping food chains that exist in an ecosystem |
| ecosystems | are all the organisms living in an area and the nonliving parts of an environment |
| biome | is a large geographic area with similar climate and ecosystems |
| population | all the organisms of the same speices that live in that area at the same time |
| habitat | the place where an organism lives |
| community | the population of all species living in an ecosystem |
| mutualism | both species benefit |
| commensalism | one organism benefits and the other one is not affected |
| parasitism | one organism benefits and the other is harmed |
| niche | how an organism obtains food, shelter, finds a mate, cares for its young, and avoids danger |
