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nutrient

a chemical substance that an organism needs to survive

consumer

an organism that obtains energy by feeding on other organisms

chemosynthesis

when organisms use chemical energy to produce carbohydrates

ecosystem

the portion of Earth and its atmosphere that contains organisms

photosynthesis

process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches

ecology

the study of the biosphere

primary producer

an organism that uses chemical or light energy to produce its own food supply

biosphere

all the organisms in one area and their physical environment

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