Or you can find it by powering on your Kindle and going to 'Settings' then 'Device Info'. Find your specific generation or model based on the first four characters of the serial number. Kindle (2007): B001, B101. Kindle 2 (2009): B002, B003. Kindle DX (2010): B004, B005, B009.
Polymorphism is an object-oriented programming concept that refers to the ability of a variable, function or object to take on multiple forms. A language that features polymorphism allows developers to program in the general rather than program in the specific.
apomorphy (derived trait) A novel evolutionary trait that is unique to a particular species and all its descendants and which can be used as a defining character for a species or group in phylogenetic terms.