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Composition
The present day composition of atmosphere is the product of a lengthy evolutionary process that began more than four billion years ago. It is composed of a mixture of many differentgases and suspended particles (Table shown below). As you can see from the table there are about 12 gases in the atmosphere. However, most of them are present in trace amounts. Nitrogen and oxygen are the major constituents while CO, is only 0.03%. Because of continual mixing of atmospheric gases, this composition is almost constant for approximately 15 krn height. We may travel. anywhere on the earth and be confident that we are breathing essentially the same type of air.
Atmosphere also contains minute liquid or solid particles in a suspended form which are known as aerosols. Most of these are found in the lower atmosphere (up to 80 km) near the earth's surface. They originate as a result of forest fires, wind erosion of soil, as sea salt crystals from ocean sprays as well as, from industrial and agricultural activities.
GRAFFIAN FOLLICLE - It appears as knob or stigma in medulla. It is round, discovered by Graff. It is covered by 2 layers - thecae externa & theca interna. From theca i
classification of protozoa
Table gives the current classification of hypertension as recommended by JNC VII. The classification is based on the mean of two or more seated readings on two or more occasions.
OVARIES - 2 in number (didelphic). White / pinkish. Almond like. 3 cm long, 2 cm wide, 1 cm thick. Lie in the lower part of abdomen attached to dorsal wall by mesovarium.
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How does brain recognize difference between high and low c and soft and loud sounds?
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organism that can not exist in the presence of oxygen ?
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