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Question : How does air enter into animal body during respiration in Periplaneta Americana ?

Answer»

`O_(2)` SPREADS by DIFFUSION from spiracle of LOWER thoracic region trachea, tracheal tubes cells.
`O_(2)` enters in MOUTH, tracheal tubes and cells of trachea.
Oxygen is released in spiracle of lower thoracic region, tracheal tubes and cells of tracheal tubes.
In sub PHARYNGEAL mouth, pharynx, tracheal tubes, tissues.

Answer :A


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