An adaptation is a trait that "evolved" for a particular condition that allows the animal to survive. Something is adaptive if it is a useful trait but not necessarily one that occurred in response to a particular selection pressure. Basically a trait is an adaptation if it is the product of selection, and adaptive if it is beneficial in the present time.
the only way you can tell if it is a adaptation is by :
Explanation:
so Basically a trait is an adaptation if it has the product of selection, and adaptive that is beneficial in the present time. which is why there is a reason that was given from the Evolutionists because even they were asked why no one was able to see the actual morphing from one species to another.
