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Will give brainliest asaapppppppppppp plz im in a major hurry to finish which of these pairs of objects exerts the greatest gravitational force on each other? object 1 and object 3 object 4 and object 3 object 1 and object 4 object 4 and object 2

What is the only country that borders portugal

Dan is an automobile engineer. he works for a well-known automobile firm. he used cae software to authorize a design before committing to making a physical prototype. which prototyping method did he use?