Final answer:
Sailors found weevils and mold in their hardtack, a staple food during long sea voyages. These infestations were common due to the conditions on ships and poor preservation methods.
Step-by-step explanation:
The two undesirable things that sailors often found in their hardtack were weevils and mold. Hardtack, a type of dry, hard biscuit, was a common food item for sailors during the age of exploration and served as a staple on long voyages due to its longevity. Unfortunately, the conditions on ships often led to the infestation of weevils, a type of beetle that bored into the bread, and the growth of mold due to moisture and poor preservation methods. While hardtack provided essential sustenance on these lengthy trips, sailors found themselves having to contend with these unwelcome additions to their meager diets.