Final answer:
The most numerous insect found on corpses are blow flies. They play a significant role in decomposition as their larvae, or maggots, feed on decaying flesh.
Step-by-step explanation:
The name of the most numerous insect found on corpses is blow flies (a). Flies are frequently attracted to decaying material where they lay their eggs, and the resulting maggots feed on the flesh. This process can be so crucial that forensic entomologists are able to determine the time of death based on the developmental stages of the maggots present on cadavers. Blow flies, including the family Calliphoridae, are among one of the first insects to arrive at a decomposing body and thus play a significant role in decomposition. In contrast, insects like bees and wasps are major agents of pollination, which demonstrates the diversity of roles insects play in natural processes and human life.