The two tiny structures located in the cytoplasm near the nuclear envelope at the beginning of prophase are called centrioles.
The study of cell structure and its function is called cell biology.
The correct answer is centriole.
There is 2 phase in the cell division. The phase is as follows;-
In cell division, the number of chromosomes gets doubled with the help of the organelle called centriole which is present at both sides of the cell.
The centriole release the spindle protein which helps to attach the kinetochore plate of the chromosome and pull it over to its respective pole.
Hence, the correct answer is centriole.
For more information about the centriole, refer to the link:-
https://brainly.com/question/18960386
