Biology
Appetite is triggered by

Pancreatic enzymes
Stomach enzymes
Environmental cues such as the smell or taste of food
Physiological drive

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Biology
Which of the following is true about veins?

Veins carry blood away from the heart, while arteries carry blood to the heart
Veins are more muscular than arteries
Veins have a smaller diameter lumen than arteries
Veins have valves; arteries do not

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