There is a photo attached
Hope this helps ^_^
Can you be more specific with the question. Are you talking about DNA coding with complementary bases?
most are formed when a plant or animal dies in a watery environment and is buried in mud and silt.
A shield vol may be produced by hot spots which lay far away from the edges of tectonic plates. Shields also occur along the mid-oceanic ridge, where sea-floor spreading is in progress and along subduction related volcanic arcs.
