GRE Reading Comprehension: ETS-GRE阅读ETS - 6VF9Y435ANHLA15R7

The author implies that which of the following was part of the long-standing view concerning pinnipeds? A. Pinnipeds are all descended from a terrestrial bearlike animal. B. Pinnipeds share a common ancestor with turtles, whales, and dugongs C. Similarities among pinnipeds are due to their all having had to adapt to aquatic life.