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Definition: Organisms include microorganisms (including bacteria and viruses), cell lines, human cells (but not human beings), sperm, oocytes (cells from which an egg or ovum develops), embryos, seeds, plants, fish, and animals

My Own Definition: An organism is anything that lives; like a plant, individual animal, or a single-celled life form.

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Definition: The branch of science concerned with classification, especially organisms; systematics

My Own Definition: Taxonomy is describing and classifying organisms and the science of naming them.

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Definition: A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring.

My Own Definition: In biology, species is a classification comprising of organisms.

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Definition: The term classification can apply to one or all of: the process of classifying a resulting set of classes the assignment of elements to pre-established classes.

My Own Definition: Classifying is the process of a resulting set of classes that are arranged in a certain order or specification.

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Definition: In phylogenetics, a single-access key is an identification key where the sequence and structure of identification steps is fixed by the author of the key.

My Own Definition: A single-access key in phylogenics is an identification key in which the classification of organisms is based on the organisms observable traits.