Assertion: porpoise's body | /r/HasProperty | large veins
Facets:
Source sentences:
text: For example marine mammals such as whales, dolphins and porpoises have streamlined bodies designed to reduce water resistance when swimming, they also have specialized lungs and muscles designed to store oxygen, thick blubber or fat to help maintain body heat in cold environments, large veins to help transfer blood to vital organs in a cold water or when in deep waters where compression can become an issue and fins, flukes, and flippers to assist with swimming.