Final answer:
The description 'Blowflies come and lay eggs on a corpse in open air' matches the egg stage of the insect life cycle, which includes egg, larva, pupa, and adult stages, and is important in forensic entomology.
Step-by-step explanation:
The stage that best matches the description, 'Blowflies come and lay eggs on a corpse in open air,' corresponds to the initial stage in the life cycle of many insects, including blowflies. This stage is the egg stage, where the female insect deposits her eggs on a substrate that will provide food for the larvae once they hatch. Most insects undergo a life cycle that includes four distinct stages: egg, larva, pupa, and adult. The larvae that hatch from these eggs are commonly referred to as maggots and they feed on decaying organic matter such as a corpse.
Forensic entomologists rely on understanding these stages to determine the time of death of a cadaver. The types and development stages of maggots present can provide critical clues in forensic investigations.