Rgarding the forensic aspects of arson, explain the endothermic reaction

Assignment: Essay Questions 

1. Regarding the forensic aspects of arson, explain the endothermic reaction and what information forensic scientists can get from this phenomenon.
2. Outline the four possible stain patterns of blood and what factual evidence can be gained from each pattern.
3. The victim of a rape is found dead in her apartment. You have two technicians to assist in evidence collection. Describe how you would use these resources for the proper collection and preservation of the evidence. Emphasize the proper collection of controls from the victim and suspect.
4. Comment on the importance and limitations of Mitochondrial DNA (mtDNA).