Ok but first lets set the scene. You have not presented any research that demonstrates an organism can adapt without limit. You challenged me on whales, flopped out and now want a definition of 'human being'.<quoted text>
Another obvious lie.
We can "define a human being". We can define what a chimpanzee is. We can define what a gray whale is. You do not like the fact that humans, chimps and gorillas are all apes.
Here is it...
A human being is a placental mammal that is also a furless obligate biped that is genetically capable of sophisticated language, higher reasoning ability and abstract thought as well as expressing the Neu5Ac molecule. No other organism or ape fits that definition.
How about you give us a demo of how an evo defines a human? Will your reply be better than "'DER', let's talk about something else"!