Answer the following question given this paragraph: All scientific explanations and interpretations are based on facts. Q: What are all scientific explanations and interpretations based on? Choices: - changes - theories - controls - facts A:
facts
Answer the following question given this paragraph: Greenhouse gases trap heat in the atmosphere. This is essential so that Earth has a more moderate temperature. Without greenhouse gases, nighttime temperatures would be frigid. Natural greenhouse gases include carbon dioxide, methane, water vapor, and ozone. CFCs and some other man-made compounds are also greenhouse gases. Human activities may increase the amount of greenhouse gases, like carbon dioxide, in the atmosphere. Q: What type of gases trap heat in the atmosphere, causing earth to have a moderate temperature? Choices: - ozone gases - carbon monoxides - sulfuric gases - greenhouse gases A:
greenhouse gases
Q: Answer the following question given this paragraph: At one time in history, it was thought that only living things were capable of synthesizing the carbon-containing compounds present in cells. For that reason, the term organic was applied to those compounds. Eventually it was proved that carbon-containing compounds could be synthesized from inorganic substances, but the term organic has remained. Currently, organic compounds are defined as covalently bonded compounds containing carbon, excluding carbonates and oxides. By this definition, compounds such as carbon dioxide (CO 2 ) and sodium carbonate (Na 2 CO 3 ) are considered to be inorganic. Organic chemistry is the study of all organic compounds. Q: Organic compounds are defined as covalently bonded compounds containing carbon, excluding carbonates and what else? Choices: - gases - crystals - acids - oxides A:
A: oxides
Question: Answer the following question given this paragraph: 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. Q: Vitamins are organic compounds that are essential in very small amounts for the maintenance of normal what? Choices: - respiration - pigments - calcium - metabolism A:
Answer: metabolism
*Question*
Answer the following question given this paragraph: The trillions of red blood cells in blood plasma carry oxygen. Red blood cells contain hemoglobin , a protein with iron that binds with oxygen. Red blood cells are made in the marrow of long bones, rib bones, the skull, and the vertebrae. These cells survive for about 120 days, and then they are destroyed. Mature red blood cells lack a nucleus and other organelles, allowing for more hemoglobin, and therefore more oxygen to be carried by each cell. Q: What is the protein that carries iron that binds with oxygen in red blood cells? Choices: - keratin - potassium - insulin - hemoglobin A:
**Answer**
hemoglobin
*Question*
Answer the following question given this paragraph: A food chain is a simple diagram that shows one way energy flows through an ecosystem. Pictured below is an example of a food chain ( Figure below ). Producers form the base of all food chains. The consumers that eat producers are called primary consumers. The consumers that eat primary consumers are secondary consumers. This chain can continue to multiple levels. Q: What is a diagram that shows a single way that energy flows throughout an ecosystem? Choices: - fuel chain - dependent chain - water cycle - food chain A:
**Answer**
food chain