during the process of a subduction, the older oceanic crust is pulled by gravity down beneath the and back into the .
the choices for both sides are
mid-ocean ridge
mantle
trench

The deserts of the sahara and australia are associated with

The transport tubes for food coming down the plants are called?

Which kind of mutation has occurred when the codon for an amino acid is changed to a stop codon? a. a silent mutation b. a missense mutation c. a frameshift mutation d. a nonsense mutation