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

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.