A pneumotachometer actually measuresby sensing the on ethier side of a fine mesh screen. O Pressure: Air Flow
O Pressure: Gas Type
O Gas Type: Pressure
O Air Flow: Pressure

A pneumotachometer actually measures Air flow by sensing the pressure on ethier side of a fine mesh screen.

so, correct option is :

=》O Air Flow: Pressure

it restores trees to areas where they once grew.

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.