are actually giant specialty stores. They feature stores the size of airplane hangars that carry a deep assortment of a particular line with a knowledgeable staff. These stores are prevalent in a wide range of categories, including books, baby gear, toys, electronics, home improvement products, and even pet supplies.

A. Category killer stores
B. killer stores
C. Supermarkets
D. Superstores
E. Supercenters

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?