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It is easy for air to pass across the wall of an air sac because the wall is thin.
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Why is it easy fot gases to pass across the wall of an alveolus?

Gases can easily pass across the wall of an alveolus due to its thin and moist membrane that allows for rapid diffusion of oxygen and carbon dioxide. Additionally, the large surface area of alveoli allows for efficient exchange of gases between the lungs and bloodstream.


Which emperor built a wall right across England?

Hadrian was the emperor who built a wall across northern England. The emperor Antoninus Pius also built a wall completely across Scotland. They were called Hadrian's Wall and the Antonine Wall respectively.Hadrian was the emperor who built a wall across northern England. The emperor Antoninus Pius also built a wall completely across Scotland. They were called Hadrian's Wall and the Antonine Wall respectively.Hadrian was the emperor who built a wall across northern England. The emperor Antoninus Pius also built a wall completely across Scotland. They were called Hadrian's Wall and the Antonine Wall respectively.Hadrian was the emperor who built a wall across northern England. The emperor Antoninus Pius also built a wall completely across Scotland. They were called Hadrian's Wall and the Antonine Wall respectively.Hadrian was the emperor who built a wall across northern England. The emperor Antoninus Pius also built a wall completely across Scotland. They were called Hadrian's Wall and the Antonine Wall respectively.Hadrian was the emperor who built a wall across northern England. The emperor Antoninus Pius also built a wall completely across Scotland. They were called Hadrian's Wall and the Antonine Wall respectively.Hadrian was the emperor who built a wall across northern England. The emperor Antoninus Pius also built a wall completely across Scotland. They were called Hadrian's Wall and the Antonine Wall respectively.Hadrian was the emperor who built a wall across northern England. The emperor Antoninus Pius also built a wall completely across Scotland. They were called Hadrian's Wall and the Antonine Wall respectively.Hadrian was the emperor who built a wall across northern England. The emperor Antoninus Pius also built a wall completely across Scotland. They were called Hadrian's Wall and the Antonine Wall respectively.


What did Antoninus pius build?

Antonius Pius built the Antonine Wall across the "waistline" of Scotland.Antonius Pius built the Antonine Wall across the "waistline" of Scotland.Antonius Pius built the Antonine Wall across the "waistline" of Scotland.Antonius Pius built the Antonine Wall across the "waistline" of Scotland.Antonius Pius built the Antonine Wall across the "waistline" of Scotland.Antonius Pius built the Antonine Wall across the "waistline" of Scotland.Antonius Pius built the Antonine Wall across the "waistline" of Scotland.Antonius Pius built the Antonine Wall across the "waistline" of Scotland.Antonius Pius built the Antonine Wall across the "waistline" of Scotland.


What can you do if you encountered a pass in the great wall?

u pass


What country has a fortified wall built across it?

China has the Great Wall of China built across it.


What is the symbol of the end of Rome's northern expansion?

The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.


Which continent is the Great Wall of China located on?

The Great Wall stretches across North China from east to west for over 6,000 kilometers. It extends from the shanhai pass at the seaside in the Hebei province in the east to the Jiayu pass in Gansu province in the west.


What was the barrier the Romans built across England?

The Romans built Hadrian's Wall across the North of England. The wall is also known as the Roman Wall, Pict's Wall, or Vallum Hadriani in Latin.


What is the symbol of the end of Romes northern expansion?

The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.The symbol of the end of Rome's northern expansion was the Antonine Wall across Scotland.


How do you get pass motholygy island?

You have to collect the 5 sacred items. The first parts are easy, but getting the items is hard. To pass the labyrinth wall with bones, spell ten. The hardest item to get is the whisker, since you have to cross a very dangerous river.


What do you call the barriers erected by the Roman across northern Britain in order to keep out the picts and Scots?

The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.


If a contractor drills into the wiring in the wall should he have to put new wiring in it in order to pass inspection?

A contractor drilled into the wall by accident. Should the contractor replace the wiring in the wall in order to pass inspection.