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Strains are variations of a species that differ in heritable traits. They can be found in plants, animals, and microorganisms. In plants, strains are often used in agriculture and horticulture to improve crop yield, disease resistance, and other desirable traits. For example, the strain of tomato known as "Solanum lycopersicum" is widely cultivated for its edible fruit. In animals, strains are used in breeding programs to produce desirable traits such as increased meat yield or improved milk production. In microorganisms, strains are used in biotechnology and medicine. For instance, the strain of E. coli known as "E. coli K-12" is widely used in genetic research due to its well-understood genome. Strains can be created through natural selection, artificial selection, or genetic engineering. They play a crucial role in various fields, including agriculture, medicine, and biotechnology.