chapt 2&3 vocabulary Word Scramble
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| Term | Definition |
| autotroph | organism that captures energy from sunlight or inorganic substances to produce its own food provides the foundation of the food supply for other organism; also called a producer |
| heterotroph | organism that cannot make its own food and gets in nutrients and energy requirements by feeding on other organisms also called a consumer |
| herbivore | heterotroph that eats only plants |
| carnivore | heterotroph that preys on other heterotrophs |
| omnivore | heterotroph that consumes both plants and animals |
| detritivore | heterotroph that decomposes organic material and returns the nutrients to soil, air, and water, making the nutrient available to other organism |
| trophic level | each step in a food chain or food web |
| food chain | simplified model that shows a single path for energy flow through an ecosystems |
| food web | model that shows many interconnected food chain and pathways in which energy and matter flow through an ecosystem |
| biomass | total mass of living matter at each trophic level |
| matter | anything that takes up space and has mass |
| nutrient | chemical substance that living organisms obtain from the environment to carry out life processes and sustain life |
| biogeochemical cycle | exchange of matter through the biosphere involving living organisms, chemical processes, and geological processes |
| nitrogen fixation | process in which nitrogen gas is captured and converted into a form plant can use |
| denitrification | process in which fix nitrogen compounds are converted back into nitrogen gas and returned to the atmosphere |
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