Final answer:
The most common pest of coarsely ground flours and cornmeal is weevils. Weevils are small beetles that infest and damage stored grains such as flours and cornmeal.
Step-by-step explanation:
The most common pest of coarsely ground flours and cornmeal is the Weevils. Weevils are small beetles that feed on stored grains, and they can infest and damage products such as flours, rice, and cornmeal. They lay their eggs in the grains, and the larvae feed on the flour, causing contamination and deterioration.