Here's why:
* Larva: This is the general term for the immature, often worm-like stage of an insect that undergoes metamorphosis.
* Fly: Maggots are the larvae of flies, primarily from the order Diptera.
* Other terms: While "worm" might be used colloquially, it's not technically accurate as maggots are not true worms. "Grub" can also be used, but it's a more general term for insect larvae and doesn't specifically denote fly larvae.
Therefore, "larva" and "larval stage of a fly" are the most accurate and specific terms to describe a maggot.