It's a salt of carbonic acid. it's called sodium bicarbonate. It contains the anion HCO3. It usually refers to bicarbonate of soda (baking soda), a white powder that is a common ingredient in antacids. It is also a byproduct of your body's metabolism.
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Incident in a factory that employs illegal Mexican immigrants. When the border police arrive the factory boss tells the workers to run. Soto's workers are forced to run for their lives, so his use of the word jogging is meant tongue-in-cheek.
The correct answer among all the other choices is a. formality. This is not something to consider when revising for clarity. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.