organism that captures energy from sunlight or in organic substances to produce its own food
organism that cannot make its own food and gets its nutrients and energy requirements by feeding on other organisms
heterotroph that eats only plants.
heterotroph that preys on other heterotrophs.
heterotroph that consumes both plants and animals.
heterotroph that decomposes organic material and returns the nutrients to soil, air, and water, making the nutrients available to other organisms.
each step in a food chain or food web.
simplified model that shows a single path for energy flow through an ecosystem.
model that shows many interconnected food chains and pathways in which energy and matter flow through an ecosystem.
total mass of living matter at each tropic level.
anything that takes up space and has mass.
chemical substance that living organisms obtain from the environment to carry out life processes and sustain life.
exchange of matter through the biosphere involving living organisms, chemical processes, and geological processes.
process in which nitrogen gas is captured and converted into a form plants can use.
process in which fixed nitrogen compounds are converted back into nitrogen gas and returned to the atmosphere.
a geologist skilled in hydrology.
process in which water evaporates from the inside of leaves to the outside through stomata.