Where do flies begin their life what did early sailors say emerging what is its name?

Flies begin their life as eggs, usually laid in decaying organic matter or other suitable environments. Early sailors observed that flies seemed to emerge spontaneously from rotting food or waste, leading them to believe they were generated from decay itself. This phenomenon was famously referred to as "spontaneous generation." The name often associated with this concept is "maggots," which are the larval stage of certain flies, particularly the common housefly.