Answer:
Alfred Wegener is the scientist who first proposed the existence of Pangaea and Panthalassa.
Explanation:
Alfred Wegener, born November 1, 1880 in Berlin and died in November 1930 in Greenland near the Eismitte base, was a German astronomer and climatologist, best known for his theory of "continental drift" proposed in 1912 and published in 1915. As an astronomer, he was interested in several related subjects such as meteorology and geology. He has made numerous expeditions to Greenland to study the meteorology of the polar regions.
His theory was based on many arguments belonging to various disciplinary fields (geodesy, geophysics, structural geology, paleontology) but was accepted by the majority of the scientific community only forty years after his death, when the mechanisms of tectonics plates became obvious.
