These animals all have similar structures, but are not closely
related. Why do they all have
wings?
A. They have the same solution to the
same problem - escaping predators by
flying.
B. They each came up with a different
solution to the problem of escaping
predators.
C. They have a common ancestor that
had wings.
D. It is unclear why they have wings.

Subduction zones form when an oceanic plate collides with another oceanic plate or continental plate. the continental crust is lighter and less dense than oceanic crust. continental crust's density is approximately 2.7 grams per cubic centimeter. oceanic crust is thinner and the average density is about 3.3 cubic centimeters. when the two crustal plates converge the oceanic plate always bends and subducts beneath a continental plate. once the oceanic crust subjects, the rocks are subjected to changes in heat and pressure. because of this, we would expect to find rocks in the area of a subduction. a) clastic b) igneous c) metamorphic d) sedimentary