a chemical substance that an organism needs to survive
an organism that obtains energy by feeding on other organisms
when organisms use chemical energy to produce carbohydrates
the portion of Earth and its atmosphere that contains organisms
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
the study of the biosphere
an organism that uses chemical or light energy to produce its own food supply
all the organisms in one area and their physical environment
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