Forensic science 3 version, 3 problems with answers

Forensic science 3 tasks, 3 variant
Task number 1
Having arrived together with the forensic medical expert, the inspector of the road patrol service of the UGIBDD and the criminal investigation officer in charge of the road accident, the investigator found a corpse of a man on the roadway of an asphalt road. On the body of the corpse there were abrasions, a wound on the right hip and multiple scratches on the left thigh. On the padding of the quilted jacket, on the shirt and shirt were found blood stains that do not coincide in their location with damage to the body. The clothes of the corpse and rubber boots were yellow sand. Next to the corpse lay a bicycle, some parts of which were heavily deformed. On the rear wheel mounting fork, to the left, fresh parallel scratches were found, light-grained particles on the tire covers. Near the corpse on the asphalt was a damp spot with the smell of gasoline. There are no other traces of vehicles near the corpse.
What is the significance of the versions when inspecting the