What are the stages in a fly's life cycle?

The correct answer identifies the stages in a fly's life cycle as eggs, larvae, pupae, and adult. This sequence reflects the complete metamorphosis that flies, like many insects, undergo.

To elaborate, the life cycle begins when adult flies lay eggs, which hatch into larvae, commonly referred to as maggots. These larvae feed and grow before entering a pupal stage. During the pupal phase, the larvae undergo significant transformations within a protective casing. Finally, they emerge as adult flies, completing the cycle.

Understanding this cycle is crucial in pest control since knowing the developmental stages helps in identifying the most effective times for intervention and control measures. Other sequences mentioned do not accurately represent the biological process, such as using terms like nymphs, which are relevant to insects with incomplete metamorphosis, not flies.