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The act of preserving, guarding, or protecting; the keeping (of a thing) in a safe or entire state; preservation.
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Wise use of natural resources.
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The discipline concerned with protection of biodiversity, the environment, and natural resources
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Genes and associated characteristics of biological organisms that are unchanged by evolution, for example similar or identical nucleic acid sequences or proteins in different species descended from a common ancestor
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(culture) The protection and care of cultural heritage, including artwork and architecture, as well as historical and archaeological artifacts
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Lack of change in a measurable property of an isolated physical system (conservation of energy, mass, momentum, electric charge, subatomic particles, and fundamental symmetries)