Q: What happens when a sodium atom loses an electron? Read this paragraph and choose the correct option from the provided answers: By losing an electron, the sodium atom becomes a sodium ion. It now has one less electron than protons, giving it a charge of +1. Positive ions such as sodium are given the same name as the element. The chemical symbol has a plus sign to distinguish the ion from an atom of the element. The symbol for a sodium ion is Na + . Choices: - becomes calcium - gains a proton - combines with hydrogen - becomes sodium ion A:
becomes sodium ion

Q: Along with nerve tissue, what kind of tissue are lecithins and cephalins important constituents of? Read this paragraph and choose the correct option from the provided answers: (a) Amino alcohols are commonly found in phosphoglycerides, which are evident in its structural formula (b). There are two common types of phosphoglycerides. Phosphoglycerides containing ethanolamine as the amino alcohol are called phosphatidylethanolamines orcephalins. Cephalins are found in brain tissue and nerves and also have a role in blood clotting. Phosphoglycerides containing choline as the amino alcohol unit are called phosphatidylcholines or lecithins. Lecithins occur in all living organisms. Like cephalins, they are important constituents of nerve and brain tissue. Egg yolks are especially rich in lecithins. Commercial-grade lecithins isolated from soybeans are widely used in foods as emulsifying agents. An emulsifying agent is used to stabilize an emulsiona dispersion of two liquids that do not normally mix, such as oil and water. Many foods are emulsions. Milk is an emulsion of butterfat in water. The emulsifying agent in milk is a protein called casein. Mayonnaise is an emulsion of salad oil in water, stabilized by lecithins present in egg yolk. Saylor URL: http://www. saylor. org/books. Choices: - heart tissue - lung tissue - skin tissue - brain tissue A:
brain tissue

Q: Q: Major climate types are based on what two things? Read this paragraph and choose the correct option from the provided answers: Major climate types are based on temperature and precipitation. These two factors determine what types of plants can grow in an area. Animals and other living things depend on plants. So each climate is associated with certain types of living things. A major type of climate and its living things make up a biome . As you read about the major climate types below, find them on the map in Figure above . Choices: - topography & temperature - environment & precipitation - oxygen & precipitation - temperature & precipitation A:
A: temperature & precipitation

Question: Q: Who lack some of the defining traits of chordates? Read this paragraph and choose the correct option from the provided answers: Adult humans lack some of the defining traits of chordates. Why are humans still classified in the chordate phylum?. Choices: - Adult Mammals - Childern - Reptiles - adult humans A:
Answer: adult humans

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Q: What happens to the volume of the gas when temperature increases but amount of gas and its pressure are constant? Read this paragraph and choose the correct option from the provided answers: There are other measurable characteristics of a gas. One of them is temperature (T). Perhaps one can vary the temperature of a gas sample and note what effect it has on the other properties of the gas. Early scientists did just this, discovering that if the amount of a gas and its pressure are kept constant, then changing the temperature changes the volume (V). As temperature increases, volume increases; as temperature decreases, volume decreases. We say that these two characteristics are directly related. A mathematical relationship between V and T should be possible except for one thought: what temperature scale should we use? We know from Chapter 2 "Measurements" that science uses several possible temperature scales. Experiments show that the volume of a gas is related to its absolute temperature in Kelvin, not its temperature in degrees Celsius. If the temperature of a gas is expressed in kelvins, then experiments show that the ratio of volume to temperature is a constant:. Choices: - nothing - volume remains constant - volume decreases - volume increases A:
**Answer**
volume increases

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Q: What is the process by which the remains of living things become fossils? Read this paragraph and choose the correct option from the provided answers: The process by which remains or traces of living things become fossils is called fossilization . Most fossils are preserved in sedimentary rocks. Choices: - decomposition - sublimation - petrification - fossilization A:
**Answer**
fossilization