Which of the following are the correct resonance structures for the formate ion,HCO2-? 
Definitions:
Endocrine System
A network of glands and organs in the body that produces, stores, and secretes hormones directly into the bloodstream to regulate the body's processes.
Pineal Gland
The pineal gland, a tiny gland located in the brain, secretes the hormone melatonin, which plays a crucial role in controlling the patterns of sleep and wakefulness.
Activity Levels
Refers to the degree of physical exertion or mental engagement in tasks or actions by an individual or group.
Endocrine Glands
Glands of the endocrine system that secrete hormones directly into the bloodstream to regulate various bodily functions.
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