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| The basic unit of a chemical element. |
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| A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction. |
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| A molecule containing a very large number of atoms, such as a protein, nucleic acid, or synthetic polymer |
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| Any of a number of organized or specialized structures within a living cell |
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| The smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic |
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| Any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products |
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| A part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans |
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| A group of interacting, interrelated, or interdependent organs forming a complex functional whole; the set of organs of the body regarded as a functional physiological unit |
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| An individual animal, plant, or single-celled life form |
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| A community of animals, plants, or humans among whose members interbreeding occurs |
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| A group of interdependent organisms of different species growing or living together in a specified habitat |
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| A biological community of interacting organisms and their physical environment |
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| A large naturally occurring community of flora and fauna occupying a major habitat, e.g., forest or tundra |
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| The regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms |
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| Biosphere, Biome, Ecosystem, Community, Population, Organism |
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| The highest taxonomic rank of organisms in which there are three groupings: Archaea, Bacteria and Eukarya |
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| A taxonomic rank that is composed of smaller groups called phyla |
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| A principal taxonomic category that ranks above class and below kingdom |
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| A taxonomic group comprised of organisms that share a common attribute. It is further divided into one or more orders |
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| A taxonomic rank used in classifying organisms, generally below the class, and comprised of families sharing a set of similar nature or character |
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| A taxonomic rank in the classification of organisms between genus and order |
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| A principal taxonomic category that ranks above species and below family, and is denoted by a capitalized Latin name |
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| 1.A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. The principal natural taxonomic unit, ranking below a genus and denoted by a Latin binomial |
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