In the illustration, which site is an oceanic spreading center?

Illustration A

Explanation:

Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.

A. Is seafloor spreading, The diagram shows magma is rising due to an upwelling convection current in the magma. The arrows show that the crust is spreading.

B. shows the occurrence of a hot spot. This is when there is a an upwelling of magma because of the currents in the mantle. So, as the ocean crust moves over the hot spot, volcanoes are formed.

C. Shows a subduction zone. One ocean crust is pushed under another  continental crust a subduction zone is formed. The melted crust becomes magma that forms an island arc of volcanic islands.

D Shows the crust spreading. This is not oceanic spreading because it is not in the ocean.

Hope this helps : D

answer///multiple alleles;

the answer to the blank provided is “an autosomal gene that is required for the expression of genes on the x chromosome”.

testis-determining factor, abbreviated as td, which is more popularly known as sex-determining region y or sry protein, is a dna-binding protein or  gene-regulatory protein/transcription factor, encoded by the  sry gene. it is the gene responsible for the initiation of male gender determination in humans.