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Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.
Negative feedback as a mechanism by which homeostatic control systems operate.
Worldwide Variations in Population and Income Levels Developed countries represent only 18% of the
Nonverbal communications convey strong, powerful messages that may be negative or positive.
Global Stratification: Income of the World's Nations
The cell wall of a Gram-negative bacterium, E. coli
Saving and Investment Rates of Industrialized Countries, 1960–1974