All Question On One Page true false The speaker starts the talk with two examples of helices found in nature. 2 A helix is a three-dimensional object. 1 The main advantage of a spiral staircase is its strength. 2 DNA contains the genetic information for most, but not all, living things. 2 A mirror image of a helix can appear to change direction. 1 The screw is an example of a conical helix. 1 Helices are much more common in manufactured objects than in natural objects. 2 It is a mystery why there are so many helices in the world. 2