Which organelle do you think is the most important and why

 All organelles are important. However, to answer your question...the most important organelle in my opinion is the nucleus. The nucleus is like the floor general or the point guard on a basketball team. It contains most of the cell's DNA, directs and controls cell function through gene expression, and mediates DNA replication during cell cycles. 

Note: Not all cells have nuclei. An example of this are the red blood cells, that lack nuclei as well as mitochondria.

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