Over 2 years because the do it every day and all kids need help
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!
Lewis and Clarke brought back maps of were certain Indian tribes were which were friendly and which were aggressive the also brought sketches of animals they didn't see on the eastern side of the u.s and plants like melon etc.
I'm currently working on this test, but I know for a fact that the answer is C, production of these goods was made a state monopoly :D
