The term encompasses all objects that can establish or disprove whether a crime has been committed or can link a crime and its victim or perpetrator

The answer would be physical evidence

Physical Evidence ecompasses all objects that can establish or disprove whethe a crime has been committed or can lik a crime and its victim or perpetrator.

Physical evidence could be a finger prints, fire mark, foot prints, fiber, paints, building materials, receipt, saliva, sperm, etc

3. i would say one, but one is not prime nor composite.