Answer:
Now a days, due to technological evolution we have modern and advanced devices than we have a 100 years ago. These devices and equipment like a DNA analyzer used in forensics have made it easier to analyze the victims DNA in no time. Not only these devices are fast and efficient but are also very accurate and help us get better and better results as the days of technological evolution are passing by....
It probably needs to dig in the ground for worms and grub. So it's an adaptation for finding food.
The results will most likely be valid because the scientists kept getting the same results after REPEATED experiments. If they just conducted one experiment then they would not have been sure if what happened was a fluke or if another thing would happen after another experiment.<span />
After the forest fire,the burnt wood will be fertilized by microbes which consider as decomposer in the food chain.It doesn't olny decompose dead animals but also organic and inorganic resources.