Englishfor English speakers
ecological
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adjective
characterized by the interdependence of living organisms in an environment
an ecological disaster
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adjective
of or relating to the science of ecology
ecological research
valence
Noun
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A valence is something that determines the number of atoms that will bond with another kind of atom.
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A valence is a certain amount of atoms or groups in a basic combination that an atom or group can actually hold.