Brian Cox’s Wonders of Life ($6) from HarperCollins lets users explore nature through 3D creatures and habits, video, and high-res images. More than two hours of video let users view creatures in HD, and more than 1,000 high-res images include commentary. It’s an extremely impressive app — a collection of fascinating nature documentaries can be at one’s fingertips within minutes. The app’s guide is noted English physicist…