Reactant
A. a substance present at the beginning of a reaction
B. a substance present at the end of a reaction
C. a particle that consists of a nucleus of protons and neutrons surrounded by a cloud of electrons.
D. a substance made up of two or more different chemical elements combined in a fixed ratio.
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Cellular Respiration
A. a non-living part of an ecosystem that shapes its environment
B. a land region on the earth’s surface covered by biological communities that group under the same climatic patterns like rainfall and temperature.
C. a set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from nutrients into ATP
D. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.