Final answer:
Food handlers need to wash their hands before resuming work when scratching the ear, petting animals, and applying hand sanitizer.
Step-by-step explanation:
The following actions by food handlers require them to wash their hands before resuming work:
Mark scratching his ear: Scratching the ear can introduce bacteria or dirt to the hands, making handwashing necessary to prevent contamination of food.
Tara petting a service animal: Touching animals can lead to the transfer of harmful bacteria, so handwashing is important to maintain food safety.
Manu applying hand sanitizer: While hand sanitizers can be used as an alternative to soap and water, it is still recommended to wash hands after applying sanitizer to ensure thorough cleaning.