Answer the following question given this paragraph: Scientists may work together on a project. One reason is that they can share equipment and personnel. Another reason is that they can share ideas. Scientists may also work separately. Even then, they use each other's data and interpretations. When one scientist publishes a paper, others will replicate the work to make sure they get the same result. If they do, the work is valid. If they don't, someone needs to find the source of the problem. Scientists openly communicate with each other on their results. They also discuss and sometimes disagree on their interpretations. If scientists do disagree, they will look for evidence so that they may resolve the disagreement. Q: What might a scientist do to confirm the work of another? Choices: - question their methods - develop a completely different experiment - study their work - replicate their work A:
replicate their work
(Question)
Answer the following question given this paragraph: The Water (Hydrologic) Cycle Water is the basis of all living processes. The human body is more than 1/2 water and human cells are more than 70 percent water. Thus, most land animals need a supply of fresh water to survive. However, when examining the stores of water on Earth, 97.5 percent of it is non-potable salt water (Figure 46.12). Of the remaining water, 99 percent is locked underground as water or as ice. Thus, less than 1 percent of fresh water is easily accessible from lakes and rivers. Many living things, such as plants, animals, and fungi, are dependent on the small amount of fresh surface water supply, a lack of which can have massive effects on ecosystem dynamics. Humans, of course, have developed technologies to increase water availability, such as digging wells to harvest groundwater, storing rainwater, and using desalination to obtain drinkable water from the ocean. Although this pursuit of drinkable water has been ongoing throughout human history, the supply of fresh water is still a major issue in modern times. Q: The primary substance that human cells, and ultimately human beings, are made up of is what? Choices: - air - oil - gas - water A:
(Answer)
water
Ques: Answer the following question given this paragraph: Like many other animals, sheep travel in herds. The tendency is for each individual sheep to stay with the herd. However, a sheep may sometimes wander off, depending on how strong the attraction is for a particular food or water supply. At other times, a sheep may become frightened and run off. Whether a sheep chooses to stay with the herd or go its own way depends on the balance between attraction to the herd and attraction to the outside influence. Q: What is the collective travel of sheep known as? Choices: - gaggle - load - den - herd A:
Ans: herd
(Q).
Answer the following question given this paragraph: Television broadcasts also use radio waves. Sounds are encoded with frequency modulation, and pictures are encoded with amplitude modulation. The encoded radio waves are broadcast from a TV tower like the one in Figure below . When the waves are received by television sets, they are decoded and changed back to sounds and pictures. Q: What are groups of tens to hundreds of thousands of stars held tightly together by gravity called? Choices: - elliptical clusters - elongated clusters - galaxy - globular clusters A:
(A).
globular clusters
Ques:Answer the following question given this paragraph: The rare earth metals are a set of seventeen chemical elements (the lanthanide series plus scandium and yttrium) that have particular importance for a variety of industrial processes and are used frequently in modern technology. Despite their name, rare earth metals are actually relatively abundant in the earth's crust. However, the extraction of many of these metals is quite difficult and has made their supply somewhat limited. They are highly sought after for this reason. Figure below shows the rare earth metals. Q: What do you call the set of seventeen chemical elements possessing particular importance for a variety of industrial processes, used frequently in modern technology? Choices: - base chemicals - fossil fuel - reactive elements - rare earth metals A:

Ans:rare earth metals
Ques: Answer the following question given this paragraph: Another example is carbon dioxide. This gas is produced from a variety of reactions, often by the burning of materials. The structure of the gas consists of one atom of carbon and two atoms of oxygen. Carbon dioxide production is of interest in many areas, from the amount we breather out to the amount of the gas produced by burning wood or fossil fuels. By knowing the exact composition of carbon dioxide, we can make predictions as to the effects of different chemical processes. Q: The structure of the gas carbon dioxide consists of one atom of carbon and two atoms of what? Choices: - sulfur - methane - Helium - oxygen A:
Ans:
oxygen