What type of samples are commonly analyzed in forensic biology?

Forensic biology primarily involves the analysis of biological samples that can provide insights into crime scenes and the individuals involved. Blood, saliva, and tissue samples are commonly analyzed because they contain DNA, which can be used for identification purposes.

Blood is often a key sample in forensic investigations as it can reveal a person's identity and can indicate injury or foul play. Saliva can also be significant, particularly in cases involving bites or bodily fluids, and it can be tested to obtain DNA for comparison with potential suspects. Tissue samples, which may include skin or other organic materials, can provide information about the victim or the presence of a suspect in violent crimes.

In contrast, while plant samples, minerals, fibers, and materials like ink and paper can be useful in certain forensic contexts, they do not typically provide direct biological evidence as blood, saliva, and tissue do. Therefore, analyzing these biological samples is crucial in forensic investigations for determining identities and establishing connections to crime scenes.