11. What substance can be stimulated to be secreted in the human body when kissing passionately?
a) Adrenaline
b) Insulin
c) Estrogen
d) Dopamine
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12. What role might human dead skin play in the air?
a) Polluting the air
b) Purifying the air
c) No effect
d) Accelerating oxidation
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13. What percentage of force can the little finger provide in physics?
a) 20%
b) 30%
c) 40%
d) 50%
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14. How much sweat can the sweat glands on a person’s foot secrete on average per day?
a) 0.5 liters
b) 1.1 liters
c) 2.0 liters
d) 3.5 liters
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15. What is the total number of cells in a human body?
a) 1 trillion
b) 10 trillion
c) 100 trillion
d) 1 quadrillion
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