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How do amoebas obtain food?

Amoebas are primitive, single-celled organisms, or protists. Most are microscopic, although a few species grow large enough that they are visible to the unaided eye. Amoebas are aquatic creatures, though their small size allows them to live in minuscule amounts of water. Lakes, rivers, puddles, irrigation ditches and swamps all host amoebas, but some species Even live inside the blood or body fluids of other animals. Many amoebas attach to a stable substrate in their habitat, while others float about freely.\nThere are many different species of amoebas in the world, and each species is adapted..

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Why are isotopes important?

The discovery of isotopes led to a new understanding of atomic structure, explaining why different samples of a given element might behave in different ways. For example, there are three stable isotopes of oxygen, and water molecules containing the lighter isotopes evaporate slightly faster than the heavier versions. Heavier oxygen molecules tend to condense out of water vapor more quickly, as well, so the water that falls from rain clouds tends to become atomically lighter as the storm progresses.\nIsotopes can also be unstable, such as the radioactive elements that power nuclear fission. Whe..

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What is plastic dip coating?

The first part of plastic dip coating involves cleaning the instrument to be coated. Next, the instrument is heated and dipped into a liquid plastic polymer and baked. The temperature depends on the characteristics of the polymer being used. Afterward, the coated instrument is removed from the heating element and cooled with water.

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How does heat move?

Conduction occurs as molecules move around and bump into one another. According to the second law of thermodynamics, faster-moving (hotter) molecules give up some of their heat energy to slower-moving (colder) molecules whenever a collision occurs. The newly heated molecules then pass some of that heat to other molecules.\nSubstances vary in their ability to conduct heat. Air and water are poor conductors. Metals tend to conduct heat rapidly, and asbestos conducts heat so poorly that it was used as a heat insulator.\nConvection happens because when a fluid (whether liquid or gas) is heated, th..

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What is the definition for a test tube rack?

The items may be color coded, which helps with identification in the processing of multiple tube samples. Some racks support four-way linkage on both ends and sides. This allows several sections to be connected to store larger samples together in an organized way. High-quality test tube racks should resist chemical corrosion and be easy to clean and disinfect.

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What is hydrochloric acid?

The oxyntic cells in the lining of the human stomach produce hydrochloric acid, one of the substances in gastric juice. The acid plays an important role in the digestive process, and it kills some microorganisms in food. Hydrochloric acid also assists in converting pepsinogen to pepsin, an enzyme which is essential to the digestion of proteins.

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What do giant pandas look like?

Wild giant pandas only live in China, in a few remote, mountainous regions in the central provinces of Gansu, Shaanxi and Sichuan. They make their homes in forests that have a dense underlayer of bamboo.\n\nAlthough many people consider these pandas to be cute, they are still bears and can be dangerous. Giant pandas are 2 to 3 feet tall standing on all four legs and can be 4 to 6 feet long. Male pandas may weigh up to 250 pounds and females about 220 pounds.\n\nWild giant pandas almost exclusively eat bamboo. They consume a small amount of other grasses and occasionally eat musk deer fawns or ..

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What is the chemical formula for milk?

Cow milk is approximately 87 percent water. The other components of milk appear in varying content. For example, there is between 30 to 35 grams of protein per liter of normal milk. Casein by weight is between 76 percent to 86 percent of the molecules that comprise milk proteins.\nThe other components of milk, such as ions, colloids and emulsions, appear in different distributions. The distribution and concentration of components depend on environmental and herd management factors as well as multiple individual factors such as:\n\nBreed of the cow\nStage of lactation\nHealth\n

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What do cristae do for mitochondria?

Mitochondria are the organelles where cellular respiration takes place, which is the process that generates chemical energy in the form of adenosine triphosphate, or ATP, from sugar. ATP is the compound that transports energy within cells, and the primary form of sugar involved in the process is glucose, according to Biology Reference.Definition of cristaeMitochondria feature two membranes that create distinct compartments within the organelles, as described by Rice University. While the outer membrane is relatively simple, the inner membrane comprises infolding structures called cristae.Funct..

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What evidence must be present to indicate a chemical or physical change?

In order for a chemical change to have occurred, a new substance must be formed. Physical changes can be undone, such as the freezing of water, while chemical changes cannot be undone; a chemical change causes the substance to change into another, different substance. Some physical changes include changes in texture, color, temperature and state. Some signs that a chemical change has occurred include presence of odor, formation of a precipitate, rusting of iron and the formation of bubbles.

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