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Firstly, the intercostal muscles contract. This causes the ribcage to move upwards and outwards. The diaphragm also contracts. This all has the combined effect of increasing the volume of the lungs. As a ...

18*24=432    432/2= 216    Therefore area of text must equal 216. And the margin must be the same width all the way round. Therefore, (24-x)(18-x)=216, 432-24x-18x+x²=216, 216-42x+x²...

Sin duda, hay muchos peligros de fumar para la salud. Uno de los peores peligros es el riesgo del cáncer de los pulmones. Fumar cigarillos produce un riesgo mayor de enfermedad de los pulmones y aumeta la...

The ideological differences between the Soviet Union and the US were undoubtedly a key factor in the early development of the Cold War. As stated in Source X, the contrasting beliefs of capitalism and com...

The Work-Energy principle states that the total work done on or by an object is equal to the total change in energy between the given initial and final states. This can be reworded to also say that the to...