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Vena Cava {Ans: blood enters the right atrium of the heart from the ____ _____ (GS)}Acceleration {Ans: Formula for _______: change in velocity -------------------- change in time (MC)}Spaces are placed between slabs of concrete in city sidewalks to? {Ans: allow for expansion and contraction}the factors of 2x^2+xy-3y^2 are {Ans: (2x+3y)(x-y)}In chemistry, to be classified as an organic substance, a substance must contain? {Ans: carbon atoms}this type of pattern on metal is made by a process called {Ans: knurling}the lens of the eye focuses light rays as they enter the eye. muscles around the lens react to light and change the shape of the lens by expanding or contracting. certain diseases or injury to the lens of the eye can result in blurry vision. according to the paragraph,the lens of the eye is used to {Ans: focus light}Lead {Ans: Car's battery has plates made from this which is immersed in sulfuric acid and water (AI)}timing belt {Ans: (or chain) what the camshaft is driven by crankshaft with (AI)}Cylinder {Ans: The following occur in an engine's ______: fuel and air are ignited, pushing the piston down, and expelling gases when piston moves