Step-by-step explanation:
1. Forensic entomologists use two main methods to evaluate approximate time of death in, one method looks at what type of insects are on and in the decomposing body and the other uses the life stages and life cycles of certain insects to establish how long a body has been dead.
2. The formula approximates that the body loses 1.5 degrees Fahrenheit per hour, so the rectal temperature is subtracted from the normal body temperature of 98 degrees. The difference between the two is divided by 1.5, and that final number is used to approximate the time since death.
3. Adults of the same species will arrive at the body at different times. Adults of different species may also arrive at different times or they may colonize the corpse in different stages of succession.
Maggots cause most of the body's decomposition because the maggot will do the majority of the eating. The larva then develops into a pupa, which eventually becomes an adult. Forensic entomologists use the presence of insects to help determine approximate time of death of corpses.