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Why do fish have gills?

Gills are specialized organs adapted to harvest the dissolved oxygen content of water, which is generally much lower than the oxygen content of air. Through the use of many small structures located on either side of the fish's throat, fish gills absorb the dissolved oxygen from the surrounding water by ram ventilation, buccal pumping or a combination of these methods to pass water over the gills.\nRam ventilation occurs in fish that lack the buccal, or cheek, muscles to pump water over the gills that would take over when the fish stops swimming. Ram ventilation requires the fish to consta..

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What is refraction?

When light passes from a fast medium to a slower medium, refraction causes the light wave to bend. The amount of bending that takes place depends on the indices of refraction for the two different media. To calculate the index of refraction, the velocity of light in a vacuum is divided by the velocity of light in a given medium. Snell's Law describes the relationship between two different indices of refraction.

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What is the correct name for P205?

The chemical reaction of burning phosphorus in dry air produces diphosphorus pentoxide. This compound is white and odorless. Its molecular weight is 141.94 grams per mole, and its boiling point is 680 degrees Fahrenheit. An application of diphosphorus pentoxide is as a dehydrating agent.\nBecause diphosphorus pentoxide is also corrosive, it can cause skin burns and eye injury. Similarly, inhaling this substance can cause symptoms that range from respiratory tract irritation to possible pulmonary edema. For these reasons, it is important to handle this substance with extreme care,

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What is Na2CO3?

One of the most important uses for sodium carbonate is in the manufacture of glass, where it is used as a flux in the melting of silica. In chemistry, sodium carbonate is often used as an electrolyte. In dyeing it is used to ensure proper chemical bonding of the dye with the fibers. In domestic use, it can soften hard water during laundry. It can also replace sodium hydroxide in cooking.

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What are the three bones of the os coxa?

The ilium forms the fan-shaped portion of the pelvis, according to the University of Arkansas. The crest, or top part, is attached to abdominal wall muscles. Ligaments are also connected to parts of the ilium. The ischium is located at the lower back portion of the hip bone and is joined to ligaments. The pubis forms the lower front portion of the pelvis. This bone attaches to the root of the penis.

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How long does primary succession take?

The process by which primary succession occurs is relatively consistent, regardless of the location in which it happens. Primary succession occurs only in small areas that lack life of virtually any kind. Bare rock forms the substrate on which the process takes place. Initially, lichens colonize the bare rock. Lichens support themselves by leaching acids into the rock and then extracting the nutrients they need. Once several lichens die and other organic matter accumulates on the rock, it begins to retain moisture. This moisture allows mosses to colonize the area. The mosses also collect organ..

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What is a good horse related science project?

Humans and horses have lived and worked together for thousands of years. Surprisingly, the topic of the cognitive and emotional dynamics between horse and human is relatively under researched. Even a small study on the emotional relationships between humans and horses could be very interesting and possibly of value to the academic community as a whole.

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How do geysers form?

Yellowstone National Park, which features more geysers than any other place in the world, is home to the most famous geyser in the world, Old Faithful. This predictable geyser emits a jet of water and steam roughly every 78 minutes.\nAs with other geysers, Old Faithful is heated by magma or molten rock. Its supply of underground water, which is a collection of melted snow and rain, begins to heat up, rising through the same cracks that gave it entry in the first place.\nAs the water and steam reaches the surface, it is forced into natural nozzles formed by mineral deposits. The pressure, combi..

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What are the boiling and freezing points of lithium?

The freezing point of lithium is the same as its melting point. It is where the solid and liquid phases of lithium exist in equilibrium. While lithium's melting point is very low compared with many of the transition metals, it is the highest of any of the alkali metals. For comparison, sodium has a melting point of 97.7 degrees Celsius, while hydrogen has a melting point of negative 259.1 degrees Celsius, which is close to absolute zero.

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Where do tsunamis take place?

Because of the displacement that occurs when a tectonic plate shifts, one major signal of an approaching tsunami is the drawback that occurs a few moments before the tsunami wave arrives. Drawback refers to the period when the shoreline recedes dramatically, exposing various sea life, such as fish and plants. The Pacific Tsunami Warning system, headquartered in Hawaii, is responsible for sending warnings to coastal cities and countries. They use seismic equipment and water level gauges in order to determine any undersea tectonic activity.\nTsunamis cause major damage in two ways. The first is ..

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