What forms when one oceanic plate is forced beneath another plate? select one: a. ocean ridges b. a rift valley c. an ocean basin d. a subduction zone and deep sea trench

Option d, A Subduction Zone

Explanation:

A subduction zone is formed when two plates collide and one sinks below the other.  Thus, option A is incorrect

The other options are incorrect because  

Oceanic ridge is the upliftment of mountains due to the convection currents beneath the ocean.  

Rift Valley is formed by the subsidence of land mass due to the action of fault or rift.

Ocean basin and deep sea trench is a depression in the earth surface

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.