Question

select the best detail to show dolphins are more closely related to humans than they are to fish. a dolphin looks more like a fish than a person. but like you, the dolphin is a mammal, a warm-blooded mammal that feeds its young on mothers milk. it is one of the many kinds of whale, the most successful group of marine mammals....millions of years ago their ancestors left the land to live in the sea. over time they evolved to suit their new environment, becoming sleek and streamlined. from vassili papastavrou, eyewitness: whale copyright 2004 by dorling kindersley

Explanation:

To determine the best detail showing dolphins' closer relation to humans than fish, we analyze the options. The key is identifying a trait shared with humans (mammals) but not fish. Dolphins being mammals (warm - blooded, feed young with milk) is a defining mammalian trait, unlike fish (which are non - mammalian, typically cold - blooded, lay eggs or have different reproductive/feeding methods). The other option about appearance is misleading as appearance doesn't reflect evolutionary/biological relatedness. So the detail about dolphins being mammals (warm - blooded, feeding young with mother's milk) is the best.

Answer:

But like you, the dolphin is a mammal, a warm - blooded mammal that feeds its young on mother's milk.