| A | B |
|---|
| producer | an organism that makes its own food; most producers are green plants |
| consumer | an organsims that obtains nutrients by eating eating other organisms |
| food chain | a sequence of organisms through which energy is passed along in an ecosystem |
| decomposer | special organisms, such as fungi (mushrooms and molds) and some bacteria, that break down dead animals' remains and return their nutrients to the soil |
| food web | a number of interconnected food chains |
| habitat | the particular environment in which organisms live, such as a desert, a pond, a forest, or a jungle |
| competition | the interaction between organisms that require the same food and resources |
| energy pyramid | a device used to show the energy relationships between producers and consumers in a food chain; the producers are always at the base of an energy pyramid |
| primary consumer | an animal that eats producers; a herbivore |
| secondary consumer | an animal that eats herbivores |
| photosynthesis | the chemical process in which a green plant uses sunlight to convert carbon dioxide and water into glucose and oxygen |
| glucose | a simple sugar produced during photosynthesis |
| chlorophyll | a green chemical in plants needed for photosynthesis |
| starch | a nutrient produced from sugar that stores energy in plants |
