Which piece of evidence did alfred winger used to develop the theory of continental drift

Alfred Wegener developed the theory of continental drift by using several lines of evidence. One line of evidence is the fit of the continents. He noticed that specific regions such as western Africa and north-eastern South America seem as if they once fit together. 
Wegener noticed that the fossils of some plants and animals were very similar even though they were founds hundreds of miles away from each other. He also noted that the rocks in regions far apart were similar in their characteristics. 

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.