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

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

There is no foolproof test for virginity among human beings. Males undergo no significant anatomical alterations as a result of their initial experience of sexual intercourse. Even the presence or absence of the females'... More » Health Women's Health Reproductive Anatomy
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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