[quote]The stream lining of fish wouldn't go away unless being less streamlined became an advantage.[/quote]Please name a situation in which that would ever be an advantage? Thank you.
English
-
Basically, if another trait is favored that makes an organism less streamlined, and there is no selection for being streamlined, then the new trait can affect the streamlined appearance of the organism. Example: antlers, fur, non webbed toes, etc.