Answer the following question given this paragraph: People protect areas that might flood with dams. In dire situations, they use sandbags ( Figure below ). Dams are usually very effective, but high water levels sometimes cause a dam to break. In that case, flooding can be catastrophic. Flood waters can also overflow a dam. People may line a river bank with levees to protect against floods. These are high walls that keep the stream within its banks during floods. Flood protection in one location sometimes causes problems elsewhere. For example, a levee in one location may just force the high water upstream or downstream. This will lead to flooding in a different location. Sometimes water gets so high that the river must be allowed to flood. Q: What do people build to protect areas from floods? Choices: - reinforced walls - drains - sewers - dams A:
dams
(Question)
Answer the following question given this paragraph: Plants are multicellular eukaryotes. They have organelles called chloroplasts and cell walls made of cellulose. Plants also have specialized reproductive organs. Almost all plants make food by photosynthesis. Life as we know it would not be possible without plants. Q: How do most plants create food? Choices: - electrolysis - atherosclerosis - glycolysis - photosynthesis A:
(Answer)
photosynthesis
Ques: Answer the following question given this paragraph: The enzyme pepsin works only in the presence of acid. A strong acid is secreted into the stomach. It provides the acid that pepsin needs. You will learn about acids in the next chapter, "Chemistry of Solutions. " Vinegar and lemon juice are two common acids. Q: The enzyme pepsin works only in the presence of what? Choices: - carbohydrates - sodium - oxygen - acid A:
Ans: acid
(Q).
Answer the following question given this paragraph: Skeletal Muscle Fiber Structure Each skeletal muscle fiber is a skeletal muscle cell. These cells are incredibly large, with diameters of up to 100 m and lengths of up to 30 cm. The plasma membrane of a skeletal muscle fiber is called the sarcolemma. The sarcolemma is the site of action potential conduction, which triggers muscle contraction. Within each muscle fiber are myofibrilslong cylindrical structures that lie parallel to the muscle fiber. Myofibrils run the entire length of the muscle fiber, and because they are only approximately 1.2 m in diameter, hundreds to thousands can be found inside one muscle fiber. They attach to the sarcolemma at their ends, so that as myofibrils shorten, the entire muscle cell contracts (Figure 38.34). Q: The plasma membrane of a skeletal muscle fiber is called the what? Choices: - sheath - annulata - soleus - sarcolemma A:
(A).
sarcolemma
Ques:Answer the following question given this paragraph: Prenatal diagnosis refers to the diagnosis of a disease or condition before the baby is born. Q: What type of diagnosis happens before a baby is born? Choices: - maternal - fetal - postnatal - prenatal A:

Ans:prenatal
Question: Answer the following question given this paragraph: The modern day formulation of gun powder is called black powder. It is still commonly used today. Its formulation is still quite similar to what was used in 9 th century China. Black powder is considered a low explosive. It is a mixture that burns quickly, but the resulting shock wave travels at subsonic speeds. The speed at which it burns is dependent on the accessibility of oxygen atoms to the carbon source. In contrast, high explosives like nitroglycerin detonate instead of burning, creating shock waves that are supersonic (faster than the speed of sound). Q: High explosives create shock waves that exceed the speed of sound, a phenomenon that goes by what term? Choices: - light speed - ion speed - turbulence - supersonic A:
Answer:
supersonic