| A | B |
|---|
| Mutualism | relationship where both benefit |
| biosphere | layer of earth that supports life |
| ecology | study of how living things relate to each other and to their environment |
| biological community | group formed by several populations |
| decomposer | breaks down dead organisms |
| parasitism | relationship where one benefits and one is harmed |
| habitat | place where an organism spends its life |
| food web | network of interconnected food chains |
| food chain | simple model for showing how matter and energy move through an ecosystem |
| commensalism | relationship between organisms in which one organism benefits and the other is neither harmed nor benefited |
| scavenger | feeds on dead organisms |
| heterotroph | obtains energy and nutrients from eating others |
| trophic level | step in the passage of energy and matter through an ecosystem |
| autotroph | Makes its own food |
| carnivore | Feeds on herbivores |
| herbivore | feeds on autotrophs |
| omnivore | feeds on producers and consumers |
| phototropism | movement in the direction of light |
| thigmotropism | movement due to mechanical or touching |
| transpiration | movement of water through a plant |
