Final answer:
Esters are compounds found in essential oils that contribute to their odor and flavor. Some esters in essential oils can have sweet flavors like oil of wintergreen or pear.
Step-by-step explanation:
Esters are compounds that contribute to the odor and flavor of many substances, including essential oils. Essential oils can have a sweet taste because they may contain esters that have pleasant odors and flavors. For example, some esters found in essential oils can have flavors like oil of wintergreen or pear.