What constitutes biological evidence?

Biological evidence encompasses a broad range of materials obtained from living organisms, making the second option the correct answer. This can include not only bodily fluids such as blood and saliva but also hair, skin cells, and other tissue types. Biological evidence plays a critical role in forensic science, as it can provide valuable information linking a suspect to a crime scene or identifying a victim.

By recognizing that biological evidence can come from any part of a living organism, it becomes evident that the definition extends beyond just DNA or bodily fluids. For instance, items like fingernail clippings or even plant material could potentially offer crucial information in an investigation. This broad understanding is essential for effective crime scene analysis and evidence collection in various forensic contexts.