What evidence must be considered when determining whether or not a trait is an adaptation? (site 1)

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.

North carolina ranks second in christmas tree production has nothing to do with biotechnology