Question

Where did the flies maggots come from?

Answer 1

the maggots came from the flies landing on the uncovered meat and laying eggs. the covered meat did not have any flies land on it and so no maggots appeared hence disproving spontaneous generation.

Answer 2

The fly lays eggs, which turn into maggots. "Maggot" is another word for larva. After a pupal stage, maggots turn into flies.