An investigator was interested in studying uag nonsense suppressor mutations in bacteria. in one species of bacteria, she was able to select two different mutants of this type, one in the trnatyrgene and the other in the trnagln gene, but in a second species, she was not able to obtain any such nonsense suppressor mutations, even after very extensive effort. what could explain the difference between the two species?

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