Breathing begins with inhalation when the contraction of the diaphragm flattens on contraction, pulling the lungs down. The contraction of these muscles increases the volume of the lungs. This reduces the air pressure in the lung to below that of the external air. This pressure difference forces air to move into the lungs where gas exchange occurs. The relaxation of the diaphragm and intercostals reduces the volume of the lungs, which then increases the air pressure inside the lung to that above the external air. This forces air out of the lungs. The cycle goes on and on. Hope this helped!
Answer: The number of plantations doubled over 20 years as farming increased.
Explanation: I took the quiz on edge.
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Explanation:
You are nothing without your problems...Solving problems makes you stronger & move forward. Imagine how terrible could life be without problems, when all your worries are gone...when you're an f
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When tectonic plates collide can form mountain ranges or large mountains, for example, the Himalayas is formed from the collision of two plates.
On the other hand when there is subduction (an oceanic plate sinks under the continental plate) mountainous systems are also formed, the lower plate melts and generates volcanic eruptions such as those that form some of the Andes mountains in South America.
Finally, deep depressions such as the Great Rift Valley are formed on land where plates are separated.
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