Select the correct answer. Which label best fits the following text? Sir Isaac Newton, the first person who studied gravity seriously, discovered what is known as the law of universal gravitation. It defines the amount of attraction of one particle of matter on another particle of matter. The formula for figuring the amount of attraction, or gravitational force, is written in the following way: The formula means that first you multiply the constant of the gravitational pull between particles, G, by the mass of particle 1, m1, and the mass of particle 2, m2. Then you divide the answer by the square of the distance between them, d2. This equation will give you the amount of pull or force between the two particles. It may seem reasonable to question the law of universal gravitation because Newton wrote it during the seventeenth century. However, modern scientists have tested it using modern and innovative scientific equipment and increased knowledge of the solar system. The formula remains true today. A. biographical text B. expository text C. persuasive text D. functional text A. It provides a first-person account of a personal experience. B. It presents information using a common structure. C. The primary purpose is to construct a logical argument. D. The author's feelings are more prominent than are facts.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals

answer; strength of association;

answer; traffic,pedestrians,parked vehicles and intersections;