* Lack of independent function: Organelles are specialized structures within a cell that perform specific functions. They cannot survive or function on their own outside of the cell.

* Dependence on the cell: Organelles rely on the cell for resources like energy, building blocks, and instructions from the cell's DNA.

* No reproduction on their own: Organelles can only reproduce within the cell, they cannot create new organelles independently.

* No complete cellular structure: Organelles lack a complete cell membrane and other essential structures needed for independent life.

Think of it this way: Organelles are like the organs of a cell. Just like your organs work together to keep you alive, organelles work together to keep the cell alive.

Important Note: There is a theory that mitochondria and chloroplasts (in plants) were once free-living bacteria that were engulfed by larger cells. This is called the endosymbiotic theory. While this theory is widely accepted, it doesn't mean that organelles are independent life forms today. They have evolved to become integrated parts of the cell and are no longer capable of surviving on their own.