No, your highly deceptive, out-of-context quote actually deals with what Darwin thought was a potential problem, if you read the full quote you will see that he finds this is not an insurpassable problem. ad hominem Circular how? You misunderstand the dolphin odor reception thing. Dolphins have no need to detect volatile odors. Why would God put redundant DNA of this nature in dolphins? Why is it encoded in practically the same way as in some land mammals? This is not similarity of function, redundant means it doesn't function. Really, this discussion would better belong in pseudoscience or religion.