Biological evidence in forensic science includes organic materials, such as blood, semen, hair, saliva and skin tissue. Forensic scientists use fingernail scrapings and bone to identify victims and criminals. Biological ... More » Science Biology

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 » Science Biology

Taxonomy, the science of classifying organisms, is based on phylogeny. Phylogeny attempts to establish the evolutionary history of a species, and taxonomy classifies organisms by this history. More » Science Biology
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To obtain DNA for DNA fingerprinting, a sample of cells from skin, hair, blood, saliva or semen is collected. The white blood cells from the sample are broken open using detergent, and then the usable DNA is separated fr... More » Science Forensic Science

Scientists categorize blood as a connective tissue for two primary reasons. According to Rutgers University, blood originates in embryo in the mesoderm, one of the three primary layers of cells; blood shares this origin ... More » Science Biology

Biological evolution is defined as organisms reproducing but experiencing changes with each generation. Evolution can happen in a small and large context. There are small genetic changes between generations, as well as l... More » Science Biology

Biological magnification is characterized by the concentration of toxic substances increasing within each of the food chain's successive links. The organisms on the lower levels of the food chain accumulate smaller amoun... More » Science Biology