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classification
| Term | Definition |
|---|---|
| organism | any individual living system |
| cell | the basic building block and smallest unit of life that can live on its own |
| Unicellular | a living thing that is made up of only one cell |
| multicellular | an organism is composed of more than one cell, with different cells working together to perform specialized functions |
| Metabolism | the complete set of chemical processes in your body's cells that turn food and drink into energy and building blocks to keep you alive |
| Stimulus | anything that causes a physical, behavioral, or functional reaction |
| Response | how a living organism reacts to an environmental event or change |
| Development | the process of growing, changing, or improving to become more advanced, larger, or mature |
| Asexual reproduction | a type of reproduction that creates offspring from a single parent without the fusion of sex cells or gametes |
| Sexual reproduction | a biological process where genetic material from two parents combines to create a genetically unique offspring |
| Spontaneous generation | the discarded scientific theory that living organisms can develop directly and routinely from nonliving matter without parents, seeds, or eggs |
| Autotroph | an organism that produces its own food from simple inorganic substances using light or chemical energy |
| Heterotroph | an organism that cannot make its own food and must consume other plants, animals, or organic matter for energy and nutrients |
| Classification | the process of arranging items, data, or organisms into groups or categories based on shared characteristics or set rules |
| Taxonomy | the science and practice of naming, describing, and classifying groups of living organisms or other things based on shared characteristics |
| Binomial nomenclature | the formal, universal two-part naming system used in Biology Online to identify every species of living thing |
| Genus | a principal taxonomic rank in biological classification that sits above species and below family, grouping together closely related species that share common physical or genetic characteristics |
| Species | is the basic unit of biological classification and a group of living organisms that can breed together and produce fertile offspring |
| Prokaryote | a tiny, single-celled organism that does not have a true nucleus or internal membrane-bound parts |
| Eukaryote | living organisms made of complex cells that contain a membrane-bound nucleus and other specialized, membrane-bound structures called organelles |
| Nucleus | the command center of a eukaryotic cell that stores DNA |
| Evolution | a gradual process of change and development into a different, often more complex, form |
| Branching tree diagram | a visual tool that maps out hierarchical relationships, sequential events, or categories by splitting a single starting point into multiple branches |
| Shared derived characteristics | a trait that two or more groups share because it evolved in their immediate common ancestor, but it is not found in more distant ancestors |
| Convergent evolution | the independent development of similar features or traits in unrelated or distantly related species |
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