(Q).
Q: Acid rain is corrosive rain caused by rainwater falling to the ground through which gas? Read this paragraph and choose the correct option from the provided answers: Sulfur enters the ocean in runoff from land, from atmospheric fallout, and from underwater geothermal vents. Some ecosystems rely on chemoautotrophs using sulfur as a biological energy source. This sulfur then supports marine ecosystems in the form of sulfates. Human activities have played a major role in altering the balance of the global sulfur cycle. The burning of large quantities of fossil fuels, especially from coal, releases larger amounts of hydrogen sulfide gas into the atmosphere. As rain falls through this gas, it creates the phenomenon known as acid rain, which damages the natural environment by lowering the pH of lakes, thus killing many of the resident plants and animals. Acid rain is corrosive rain caused by rainwater falling to the ground through sulfur dioxide gas, turning it into weak sulfuric acid, which causes damage to aquatic ecosystems. Acid rain also affects the man-made environment through the chemical degradation of buildings. For example, many marble monuments, such as the Lincoln Memorial in Washington, DC, have suffered significant damage from acid rain over the years. These examples show the wide-ranging effects of human activities on our environment and the challenges that remain for our future. Choices: - sulfide dioxide - carbon dioxide - essential dioxide - sulfur dioxide A:
(A).
sulfur dioxide

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Q: What paired human organs play a vital role in maintaining homeostasis? Read this paragraph and choose the correct option from the provided answers: The kidneys ( Figure below ) are important organs in maintaining homeostasis , the ability of the body to maintain a stable internal environment despite a changing environment. Kidneys perform a number of homeostatic functions. Choices: - lungs - ears - eyes - kidneys A:
(A).
kidneys

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Q: What kind of process is boiling? Read this paragraph and choose the correct option from the provided answers: As with melting, the energy in boiling goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. So boiling is also an isothermal process. Only when all of a substance has boiled does any additional energy go to changing its temperature. What happens when a liquid becomes a gas? We have already established that a liquid is composed of particles in contact with each other. When a liquid becomes a gas, the particles separate from each other, with each particle going its own way in space. This is how gases tend to fill their containers. Indeed, in the gas phase most of the volume is empty space; only about 1/1,000th of the volume is actually taken up by matter (Figure 10.4 "Liquids and Gases"). It is this property of gases that explains why they can be compressed, a fact that is considered in Chapter 6 "Gases". Figure 10.4 Liquids and Gases. Choices: - chemical - spheroidal - cavitation - isothermal A:
(A).
isothermal