MCQ
The total number of ear bones in man is
- A$3$
- ✓$6$
- C$4$
- D$2$
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$(I)$ Transports the atmospheric air to the alveoli.
$(II)$ Clears it from foreign particles.
$(III)$ Humidifies respiratory system.
$(IV)$ Brings air to body temperature
$R -$ In $C_3$ plants $CO_2$ occurs in mesophyll cells and bundle sheath cells.