$A$ - Smoking increases $O_2$ content in blood.
$R$ - Nicotine stimulates the adrenal gland.
$R$ - Nicotine stimulates the adrenal gland.
- A$A$ and $R$ both are correct.
- B$A$ and $R$ both are incorrect.
- C$A$ is correct,$R$ is incorrect.
- D$A$ is incorrect,$R$ is correct.
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$2.$ $Salmonella$ $typhi$ directly affects the respiratory system.
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$1.$ Dysentery,plague,and diphtheria are caused by bacteria.
$2.$ $Salmonella$ $typhi$ directly affects the respiratory system.
$3.$ Amoebiasis and Ascariasis are caused by contaminated water.
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