What type of evidence do you think would be most difficult to collect? why? ( explain answer)

Depends on the situation Usually the hardest would be blood samples of the Unknown Subject. Again It depends on the situation.

It usually depends on what is at the crime scene, but usually the evidence that is most difficult to collect would be fibers, hair, or specs of dirt. The reason is because they are really tiny and easy to miss, not to mention they are harder to analyze than DNA samples, blood, and other crime evidence. Hope that helps! :)

the dark variety, as they are not visible on the dark tree barks

explanation:

i need an image of the diagram