Browsed by
Category: TOEFL Reading Practice Tests With Answers

TOEFL Reading Practice Tests With Answers | THE ORIGINS OF CETACEANS

TOEFL Reading Practice Tests With Answers | THE ORIGINS OF CETACEANS

THE ORIGINS OF CETACEANS It should be obvious that cetaceans-whales, porpoises, and dolphins-are mammals. They breathe through lungs, not through gills, and give birth to live young. Their streamlined bodies, the absence of hind legs, and the presence of a fluke1 and blowhole2 cannot disguise their affinities with land dwelling mammals. However, unlike the cases of sea otters and pinnipeds (seals, sea lions, and walruses, whose limbs are functional both on land and at sea), it is not easy to…

Read More Read More