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 »

Physiology is the study of function in living systems; thus, physiological changes are changes that occur within an organism, whether at the level of organism, organ system, organ, tissue, cell or organelle. Physiologica... More »

Baby Center and MedicineNet.com provide drawings and photos of fetal development during pregnancy. Baby Center hosts a slideshow of drawings depicting the development of a fetus from conception up to delivery. The pictur... More »

As defined by the Psychology Dictionary, a biological factor is that which affects the behavior and function of an organism and includes any condition that has a psychological effect on a living being. 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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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 »

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 »