Pasteur
Francesco Redi disproved the theory of spontaneous generation in larger organisms during the 1600s with this experiment. By using flasks containing meat -- one open and one sealed -- Redi discovered that maggots only appeared on the uncovered meat that could be accessed by flies. The maggots were hatching from eggs laid on the meat, not from the meat itself. Pasteur continued the experimentation regarding spontaneous generation in the 1800s with the growth of bacteria on soup.
The doctor who demonstrated that maggots hatch from eggs laid by flies on meat was Francesco Redi, an Italian physician and poet. In the 17th century, he conducted experiments that disproved the theory of spontaneous generation, showing instead that maggots arise from fly eggs. His work laid the foundation for modern biology and the understanding of life cycles in organisms.
Maggots are the larvae of flies, and they do not lay eggs themselves. Adult flies lay eggs, which then hatch into maggots.
If there are no flies then there will be no maggots. No flies, no eggs, no maggots.
No , maggots are from flies
Flies lay their eggs and they hatch as maggots
Maggots are the young of flies and will grow up to be adult flies and those flies can reproduce.
Maggots
Baby flies are called maggots. Maggots are what hatch from fly eggs. Maggots then turn into pupae and finally emerge as house flies. There is really no such thing as baby flies, only flies that may appear smaller in size.
No flies lay maggots, flies lay eggs, these eggs will hatch into maggots.
Maggots do not spin a cocoon to become flies. Flies lay eggs which maggots hatch from and then go through a complete metamorphosis.
no there are essentially no maggots in ketchup however if you do happen to leave ketchup out and flies get to it, maggots are the spawn of flies and there will most likely be some in your old ketchup :)