Question

wegener was intrigued when the same mesosaurus fossils, an ancient freshwater reptile, showed up on different continents. what hypothesis did he propose to explain this? the fossils were moved by humans. the continents were at one time joined together. the fossils must be of different species. the mesosaurus swam between the two continents.

Explanation:

Wegener's work on continental drift is based on evidence like identical fossils on different continents. Mesosaurus was a freshwater reptile, so it couldn't swim between continents (ruling out that option). Humans didn't exist then to move fossils, and the fossils are of the same species. So his hypothesis was that continents were once joined (continental drift precursor).

Answer:

B. The continents were at one time joined together.