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What part of the plant does lettuce come from?

There are three distinct types of head lettuce. Crisphead or iceberg lettuce has firm heads of leaves with obvious veins. Butterhead lettuce forms softer, more pliable heads with less obvious veining. Cos lettuce grows in large, upright heads with tender, narrow leaves.\nLettuce plants are harvested before they flower and go to seed. Head lettuce is harvested by removing the head of compact leaves. Loose leaf lettuce is harvested by cutting the leaves off about an inch above the ground. Most varieties of loose leaf lettuce regrow after the initial harvest, producing several harvests from the s..

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What is the molecular geometry of ClO2?

Chlorine dioxide has an odd number of valence electrons and is considered a paramagnetic radical. The compound is composed of a central chlorine atom with two oxygen atoms connected via covalent bonds. Chlorine dioxide has two resonance structures with a double bond on one side and a single bond and three electrons on the other. Both resonance structures have a bent molecular geometry with an O=Cl-O bond angle of 117.6 degrees. Chlorine dioxide is prepared in a laboratory by the oxidation of sodium chlorite, or NaClO2. CL2 is used as the oxidizing agent, acting on NaClO2 to produce chlorine di..

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What is the function of the villi?

The villi also have digestive enzymes on their surface. Digested food passes into the villi through diffusion. Villi have very thin walls that are about one cell thick, and this helps ensure superior absorption. The villi are connected to blood vessels to allow nutrients to be carried away by the blood. Villus capillaries collect the simple sugars and amino acids taken in by the villi into the bloodstream. Villus lacteals are lymph capillaries that collect the absorbed fatty acids and glycerol and take it to the rest of the body through the lymph fluid.\nVilli also help the food to move along..

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What does formaldehyde smell like?

Formaldehyde is considered a volatile organic compound. This means that this substance can evaporate into the air at room temperature. A large amount of formaldehyde gas released into the air can cause different types of health problems in people.Formaldehyde has multiple applications that include construction materials, adhesives, fabrics and many other commonly used products. The chemical formula for this chemical is CH2O, and its molecular weight is 30.025 grams per mole.

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What causes surface tension?

Surface tension can cause the surface of a liquid in a small container to be rounded. It can also support materials that are denser than the liquid as a whole. For example, a needle or paperclip can float on the surface of a glass of water, but if the surface tension is broken, they will both sink to the bottom.

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What is a pedal pulse?

The pedal pulse is often taken in patients who have foot or leg conditions to monitor adequate blood flow in the extremities. In addition to the foot and ankle area, the human body has several pulse regions. They are found in areas where an artery is close to the skin. Pulse rates vary according to age and fitness level.

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What are the uses of slate?

Man has used slate in roofing for centuries, and the slate roofs of some buildings have lasted for centuries. The long-wearing material endures the effects of weathering well, but the weight of slate roofing requires additional structural support. The cost of these extra materials puts slate out of reach for many homeowners.\nSlate topped with felt is the traditional playing surface for pool tables. Manufacturers use up to 1-inch slate in the manufacturing process. The stone is ground to a fine finish before manufacturers cover it with felt. Slate does not warp, as many other materials used in..

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How do cactuses adapt to their environment?

The famous spines of a cactus are an adaptation which minimizes the surface area when compared to the more ubiquitous leaves of other plants. These spines also protect the cactus from the trespasses of herbivores. Encyclopedia Britannica states that cacti are flowering plants, with more than 2,000 species spread across North and South America.

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How do you convert amps to watts?

Single-phase and three-phase currents are distinguished by how the power is distributed, with single-phase systems supplying all of the voltages in unison while three-phase systems supply the voltages in three sequential stages. In three-phase currents, if the voltage is taken from line to line, the coefficient is the square root of three. If the voltage is measured from the line to a neutral ground, then the coefficient is simply three. The power factor is the ratio of the measured power in the line to the theoretical power supplied to the circuit.

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What is Agenda 21?

As of 2015, over 178 United Nations member governments h e adopted Agenda 21 as agreed upon during the United Nations Conference on Environment and Development on June 14, 1992. To complement Agenda 21, participating United Nations member countries also follow recommendations and guidelines presented through the Statement of Principles for the Sustainable Management of Forests and the Rio Declaration on Environment and Development.

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