Q: What allows theories to be widely accepted? Read this paragraph and choose the correct option from the provided answers: The term theory is used differently in science than it is used in everyday language. A scientific theory is a broad explanation that is widely accepted because it is supported by a great deal of evidence. Because it is so well supported, a scientific theory has a very good chance of being a correct explanation for events in nature. Because it is a broad explanation, it can explain many observations and pieces of evidence. In other words, it can help connect and make sense of many phenomena in the natural world. Choices: - hypothesis - observation - theory - evidence A:
evidence

Q: What element, which often forms polymers, has a unique ability to form covalent bonds with many other atoms? Read this paragraph and choose the correct option from the provided answers: Carbon has a unique ability to form covalent bonds with many other atoms. It can bond with other carbon atoms as well as with atoms of other elements. Because of this ability, carbon often forms polymers. A polymer is a large molecule that is made out of many smaller molecules that are joined together by covalent bonds. The smaller, repeating molecules are called monomers . (The prefix mono - means "one" and the prefix poly - means "many. ") Polymers may consist of just one type of monomer or of more than one type. Polymers are similar to the strings of beads pictured in the Figure below . Like beads on a string, monomers in a polymer may be all the same or different from one another. Choices: - iron - hydrogen - oxygen - carbon A:
carbon

Q: Vitamins are organic compounds that are essential in very small amounts for the maintenance of normal what? Read this paragraph and choose the correct option from the provided answers: Vitamins are organic compounds that are essential in very small (trace) amounts for the maintenance of normal metabolism. They generally cannot be synthesized at adequate levels by the body and must be obtained from the diet. The absence or shortage of a vitamin may result in a vitamin-deficiency disease. In the first half of the 20th century, a major focus of biochemistry was the identification, isolation, and characterization of vitamins. Despite accumulating evidence that people needed more than just carbohydrates, fats, and proteins in their diets for normal growth and health, it was not until the early 1900s that research established the need for trace nutrients in the diet. Because organisms differ in their synthetic abilities, a substance that is a vitamin for one species may not be so for another. Over the past 100 years, scientists have identified and isolated 13 vitamins required in the human diet and have divided them into two broad categories: the fat-soluble vitamins, which include vitamins A, D, E, and K, and the water-soluble vitamins, which are the B complex vitamins and vitamin C. All fatsoluble vitamins contain a high proportion of hydrocarbon structural components. There are one or two oxygen atoms present, but the compounds as a whole are nonpolar. In contrast, water-soluble vitamins contain large numbers of electronegative oxygen and nitrogen atoms, which can engage in hydrogen bonding with water. Most water-soluble vitamins act as coenzymes or are required for the synthesis of coenzymes. The fatsoluble vitamins are important for a variety of physiological functions. The key vitamins and their functions are found in Table 18.8 "Fat-Soluble Vitamins and Physiological Functions" and Table 18.9 "Water-Soluble Vitamins and Physiological Functions". Table 18.8 Fat-Soluble Vitamins and Physiological Functions Vitamin. Choices: - respiration - pigments - calcium - metabolism A:
metabolism

Q: Carnivores are animals that eat other animals. the word carnivore is derived from latin and literally means this? Read this paragraph and choose the correct option from the provided answers: Carnivores are animals that eat other animals. The word carnivore is derived from Latin and literally means "meat eater. " Wild cats such as lions, shown in Figure 34.3a and tigers are examples of vertebrate carnivores, as are snakes and sharks, while invertebrate carnivores include sea stars, spiders, and ladybugs, shown in Figure 34.3b. Obligate carnivores are those. Choices: - amount eater - thick eater - leaf eater - meat eater A:
meat eater