Humans, dogs, lions, fish and any other living being are all examples of organisms. By definition, an organism is any contiguous living system or being. Even plants are examples of organisms. More »

Considered "the building blocks" of living organisms, proteins direct many of the most basic functions in organism from the transport of oxygen, to the building of tissues to the replication of DNA. These large molecules... More »

Bacteria are some of the best examples of prokaryotic organisms. These organisms do not have a membrane-bound nucleus and lack the well-distinguished cell features found in eukaryotes. More »

An organism that eats other organisms, living or dead, is called a consumer. Consumers are known by other names, depending on the type of food consumed. Categories of consumers include the omnivores, the meat-eating carn... More »

A multicelled, or multicellular, organism is any living being comprised of more than one cell. Typically, multicellular life differentiates cells into specialized tasks, which in larger organisms can form tissues and org... More »

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A physiological change is a change in the normal function of a living organism. An example of a physiological change is the everyday shedding of dead skin cells in humans. More »

Nonpathogens are usually harmless microbes that inhabit a living organism, such as Staphylococcus aureus and candida. Some nonpathogen microbes are bacteria that can be beneficiary for the human organism, such as lactic ... More »