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CNG is made by compressing natural gas (which is mainly composed of methane, CH4), to less than 1 percent of the volume it occupies at standard atmospheric pressure. It is stored and distributed in hard containers at a pressure of 20–25 MPa (2,900–3,600 psi), usually in cylindrical or spherical shapes.
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In Earth's sky, the Sun, Moon, and stars appear to move from east to west because of the rotation of Earth (so-called diurnal motion).
The celestial objects appear to move across the sky from east to west because the earth is movimg about its axis from west to east. It takes nearly 24 hours for the earth to complete one revolution about its axis from west to east, but to us it appears that earth is stationary and various objects in space are moving from east to west.
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Nearsightedness, or myopia, is the most common refractive error of the eye, and it has become more prevalent in recent years.
If you are nearsighted, you typically will have difficulty reading road signs and seeing distant objects clearly, but will be able to see well for close-up tasks such as reading and computer use.
Other signs and symptoms of myopia include squinting, eye strain and headaches. Feeling fatigued when driving or playing sports also can be a symptom of uncorrected nearsightedness.
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The smoothness of the contacting surfaces influences friction. If two surfaces are rough than if they are smooth, then is important to action witha greater force. However, friction decreases with smoothness only to a degree; friction actually increases between two extremely smooth surfaces because of increased attractive electrostatic forces between their atoms.
The factors that affect friction are as follows:-
- Surface on which the object is moved or the nature of the surface. i.e., rough surface, smooth surface, liquids etc
- The weight of the object or the amount of force on the surface by the object
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Kritika Trehan 8 years, 4 months ago
A planarian is one of many flatworms of the Turbellaria class.[1] It is also the common name for a member of the genus Planaria within the family Planariidae. Sometimes it also refers to the genus Dugesia.[2]
Planaria are common to many parts of the world, living in both saltwater and freshwater ponds and rivers. Some species are terrestrial and are found under logs, in or on the soil, and on plants in humid areas.
<a id="full-answer">Reproduction</a>
Despite the similarity of planarian sexual reproduction to that of other animals, planaria are capable of reproducing asexually by binary fission. This mechanism takes advantage of the planarians' extreme facility to regenerate lost sections of their bodies. Once a planarian is split in half – a division that can take place along any axis of its body: latitudinal, longitudinal or coronal – each section of the body activates special cells called neoblasts. Neoblasts are adult stem cells that can divide into new cell lineages that later specialize into all the body's tissues. Neoblasts at the site of the break begin generating new tissue to replace the structures each half has lost, which results in two new flatworms.
This process of reproducing via whole-body division can happen as a result of traumatic injury, or it can be initiated by the planarian itself as a normal process called transverse fission. When the planarian initiates the process, its body splits latitudinally between head and tail sections.
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