Fossils provide scientists with evidence that allows them to hypothesize how living organisms have evolved over time. tiktaalik roseae was a unique organism that has been shown to be 375 million years old. it has been nicknamed the “fishapod” because it is believed to be a common ancestor of both fish and tetrapods, the first four-legged animals. mc023-1.jpg how would a scientist study the relationship between the tiktaalik roseae and modern fish and tetrapods? create a diagram that hypothesizes ancestry use relative dating use transitional fossils to determine age review its analogous structures