Which sentence states the central idea of the passage? Many people think that only humans can use language. But scientists
have discovered that dolphins also communicate through a kind of
"talking." Dolphin language, unlike human language, does not use
words. Instead, dolphins use clicks, squeaks, and other sounds to give
each other information. They even seem to use certain sounds to "talk"
about specific dolphins. In this way, dolphins can be said to have
names!