Which type of evidence can include various forms of organic materials?

Biological evidence includes a variety of organic materials such as blood, hair, saliva, semen, tissues, and other bodily fluids. This type of evidence is crucial in forensic science because it can provide direct links between a suspect and a crime scene or victim. The analysis of biological evidence can be used for DNA profiling, which is a powerful tool in criminal investigations.

In contrast, physical evidence refers to tangible items that can be collected at a crime scene, such as fingerprints, weapons, or any non-biological material. Circumstantial evidence consists of information that implies a fact or event but does not directly prove it, such as witness testimonies or circumstances surrounding a crime. Direct evidence provides firsthand proof of a fact, like eyewitness accounts or video recordings. Thus, biological evidence is unique in its ability to represent living organisms and genetic material, making it the correct choice for the question asked.