What type of adaptation would be needed by an organism that lives in a river

Leila has dimples because she received a gene copy from her father that coded for dimples. this means that dimples are an example of a trait that is

What is the relation ship between structure and function in an organism

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?