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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.
this is a sticky substance that traps dust from the inhaled air
a food chain that does not start with plants??
Q. Mention the different methods of wheat milling? Three methods of wheat milling are stone milling, roller milling and fragmentation milling.
Structure of Atoms Elements are pure substances. Elements are composed of a single kind of atom, as opposed to compounds which contain two or more kinds of atoms (see lesson 5).
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Explain the Composition and Functions of Gastric Juice In resting condition, the secretion of gastric juice is little in amount and is about 10- 15 ml. After taking each meal,
Biotechnology in agriculture: Production of enough food to meet the demands of an ever-increasing population in the world is a major task and a challenge to agricultural scient
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