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How the lungs work
Cut the bottom off a large bottle. Fit a cork to the neck with a Y tube in it. On every of the lower limbs of the Y tie a rubber balloon or a number of small bladder.
Tie a sheet of brown paper or sheet rubber round the bottom of the jar, with a piece of String knotted by a hole and sealed with wax. Pulling this string lowers the diaphragm and air enters the neck of the Y piece causing the balloons to dilate.
Pressing the diaphragm upwards has the opposite effect.
A compressed air pop-gun Use a straight piece of glass or plastic tubing of 1 or 2 cm in diameter and 15 or 20 cm in length. Make a piston by twisting some string on a pencil t
Define the Type of Macrophages Macrophages are of two types: a) Fixed types, and b) Wandering types
what are details on fermentation technology?
Greenhouse effect: Scientists have reason to believe that air pollution. both due to carbon particles or soot and carbon dioxide would affect weather. A rise in surface temper
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what is Amoeba shaped like
State the categories of bulky organic manures These are evaluated mainly on the basis of their nitrogen content and the amount of organic matter present in them. The two import
The characteristic properties of an aquifer can be used to calculate groundwater velocities, v groundwater (L/T), according to: V groundwater = K H / η (dh/dl) where KH (L/
Explain about the soil formers Soil development or soil genesis as it is called, is the result of a number of factors such as parent material, topography, time, climate and bio
Peripheral nervous system (pns): Except for the brain and the spinal cord, the rest of the network of nerves and neurons is included in tha peripheral nervous system, or
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