Verified Answer :

Assuming that the D label refer to the two blocks right outside the nucleus, 

They are called centrioles.

In animal cell, the centrioles are responsible in the process of Cell division

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Answer;

Centrioles

Explanation;

  • Centrioles are organelles that are only found in animal cells.
  • Centrioles are important organelles that functions by helping the process of cell division in animal cells. This is by helping the formation of spindle fibers whose role is to separate chromosomes during cell division.
  • Additionally, centrioles also play a very important role in celiogenesis, the formation of cilia and flagella on the surface of cells. The cilia and flagella enhance the movement of cells.

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