Natural selection will only cause evolution if there is enough genetic variation in a population. Before the discovery of Mendelian genetics, one common hypothesis was blending inheritance. But with blending inheritance, genetic variance would be rapidly lost, making evolution by natural selection implausible.
Amazon Kindle Fire (2012) The Kindle Fire has a multitouch-capable 7-inch IPS display, a dual-core processor, and at 14.6 ounces, a pretty lightweight frame. The resolution on that screen is 1024 x 600. The battery is rated to last for eight hours of continuous reading or 7.5 hours of video playback (with WiFi switched off).
It's not one of the new Fire HD tablets, and it's definitely not the Kindle Fire HDX. The 7-inch Kindle Fire has a 1024 x 600 resolution display (although, with IPS), a 1.3Ghz quad-core processor, 8 gigabytes of internal storage, one gigabyte of RAM, and your basic front- and rear-facing cameras.