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How many ribs are attached to the sternum?

The thoracic cavity of the human skeletal system comprises the sternum, thoracic vertebrae and their intervertebral discs, and the ribs and their costal cartilages. The sternum is the long, flat bone located in the middle region of the chest cavity. Its basic structure includes the xiphoid process, manubrium and body. The notched manubrium is the topmost component of the sternum. Technically, the body of the sternum is called the breast bone, located below the manubrium. The xiphoid process is a small, smooth cartilagenous substance that petrifies by the time a person reaches 40 years of age.H..

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What is a petrographic microscope?

Other components include a Bertrand lens and a light condenser used in conoscopic identification, a rotating stage with vernier scales for reading sections of arc and accessory plates, such as a wave plate. The microscope is used to observe the characteristics of the mineral structure. A petrographic microscope requires training to use, which is available at geology and mineralogy departments at universities.

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What eats an eagle?

Predatory behavior against eagles depends on the age and size of the eagle. For instance, golden eagle nestlings are predatory targets for grizzly bears and wolverines, but there are very few reports of predation of adult golden eagles or golden eagle eggs. Some eagle species, such as the American bald eagle, may compete for food with other raptors, but they are not under direct predatory threat from these birds, which include osprey, gulls and hawks. Ravens have been known to harass certain species of eagle, but this does not amount to predatory behavior. Overall, eagles are relatively safe f..

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What are the three small bones in the ear?

The human ear contains three small bones, two muscles, ligaments and cartilage, all of which work together to process sound waves and facilitate human hearing. The malleus bone, which is also called the hammer, and the body of the incus, or the anvil, are tightly fitted together and are found in the upper portion of the eardrum cavity. The stapes bone, which is also known as the stirrup, lies horizontally at a right angle with the incus. The positioning of the bones creates a small oval window, which holds its formation with ligaments, all of which promotes optimal hearing.

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What metals are used to make stainless steel?

Over 150 grades of stainless steel exist and are classed according to the percentage of chromium they contain. Austenitic steels contain at least 16 percent chromium and are highly resistant to corrosion. Ferritic steels contain 10.5 to 27 percent chromium and cannot be work-hardened. Martensitic steels contain 12 to 14 percent chromium and are magnetic. Duplex steels are a mixture of austenite and ferrite and can be double the strength of austenitic stainless steel.

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What is the difference between the Earth and the moon?

A day is much shorter on Earth than on the moon. The length of a day on the Earth is 24 hours, while the length of a day on the moon is equal to slightly over 27 Earth days. The Earth is significantly larger than the moon. Its surface area is equal to 196,936,994 square miles, while the surface area of the moon is 14,647,439.75 square miles. The moon has more extreme temperatures than does the Earth. The minimum temperature on the moon is -387 degrees Fahrenheit, but the minimum temperature on Earth is a somewhat warmer -126 degrees Fahrenheit. The maximum moon temperature is 253 degrees Fahre..

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What is a gas evolution reaction?

It is sometimes possible to tell that a chemical reaction has occurred by observation of the newly formed products and their new chemical properties. The evolution of a gas is one of several possible results of a chemical reaction. According to Rhode Island College, others include the emission of heat or light, a change in color or the formation of a precipitate. A chemical reaction that produces at least one gas as a product is considered a gas evolution reaction.

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What are the uses of calcium chloride?

Calcium chloride is a salt composed of one part calcium and two parts chlorine. This compound is a milky crystalline substance. Calcium chloride attracts water very easily, so it is used for desiccation, also known as the process of drying. Dry calcium chloride must be stored carefully so that it does not accumulate moisture from atmospheric conditions.\nCalcium chloride is used to increase water hardness in swimming pools, reducing erosion of the pool lining. Other compounds are used for a similar purpose, often in conjunction with calcium chloride.\nSome brands of pickles get their very salt..

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How can I fill in a periodic table?

The arrangement of the elements in the table groups them together according to the likeness in their physical and chemical characteristics. A row of chemical elements is called a period, while a column of chemical elements is called a group. Elements are grouped into even larger categories called blocks. The four blocks of the periodic table are designated s, p, d and f. Elements in close proximity to one another in the periodic table generally have similar physical and chemical properties.\nThe atomic number, by which the elements of the periodic table are ordered, is a whole number indicatin..

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Is an NO2 supplement safe?

NO2 has side effects. Although this side effect is rare, NO2 reduces dopamine levels in the brain which may have a negative effect on motivation levels, sleep cycles, cognitive skills as well as long and short term memory. Histidine is an acid often found in supplements that may deplete zinc levels in the body. High levels of histidine may cause diarrhea, impotence, impaired appetite and delayed sexual maturation. This side effect can be avoided by adding foods rich in zinc, such as crabs, oysters, peanuts and pumpkin seeds, to one's diet. Stomach cramps and nausea is another side effect...

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