Inhaled air passes through which of the following in the last?

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what is the height of The atmosphere layer mesosphere?

A. 85 km B. 50 km C. 40 km D. 10 km...

Acid deposition causes ______________________?

A. the greenhouse effect to lessen B. lakes and forests to die C. acid indigestion in humans D. all the above are correct...

The Scientist who told “Heat is a form of Energy” was___________?

A. Thomas Alva Edison B. Newton C. Joule D. Kepler...

Tooth decay is caused by?

A. Salt B. Sugar C. Calcium D. Formalin...

speed of sound in dry air at 20 °C is___________?

A. 353 m/s B. 345 m/s C. 343 m/s D. none of them...