Use the following to answer question: 
-(Table: Total Cost and Output) Use Table: Total Cost and Output,which describes Sergei's total costs for his perfectly competitive all-natural ice cream firm.How many tubs of ice cream will Sergei produce in the long run?
Definitions:
Melatonin
A hormone produced by the pineal gland that regulates sleep-wake cycles, commonly used as a supplement to aid sleep.
Rheumatoid Arthritis
A chronic autoimmune disorder that primarily affects joints, leading to inflammation, pain, and eventual joint destruction.
Master Biological Clock
A mechanism within the brain, specifically the suprachiasmatic nucleus of the hypothalamus, that regulates the circadian rhythms of the body, influencing sleep-wake cycles, hormone release, and other physiological processes.
Histamine Release
The process by which histamine is released from immune cells into the body, often in response to an allergic reaction, leading to symptoms like itching, swelling, and redness.
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