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).
The smaller version of the Amazon Kindle Fire HD has a 1280 x 800 7-inch IPS screen. Other than the different display size, the Android-based tablet features the same dual-anntena 5GHz Wi-Fi, stereo speakers, OMAP 4470 processor from Texas Instruments, HDMI, and Bluetooth connectivity as the 8.9-inch Fire HD.