It is thought that the mitochondrion was once an individual organism, which later became a part and parcel of the eukaryotic cell in the course of evolutionary history. The facts that support this theory are that a mitochondrion has its own DNA and ribosomes, and can produce many of the proteins it needs. When it was independent, it belonged to the kingdom ___.

It is thought that the mitochondrion was once an individual organism,

1.	It is thought that the mitochondrion was once an individual organism, which later became a part and parcel of the eukaryotic cell in the course of evolutionary history. The facts that support this theory are that a mitochondrion has its own DNA and ribosomes, and can produce many of the proteins it needs. When it was independent, it belonged to the kingdom ___.
Answer» It is thought that the mitochondrion was once an individual organism, which later became a part and parcel of the eukaryotic cell in the course of evolutionary history. The facts that support this theory are that a mitochondrion has its own DNA and ribosomes, and can produce many of the proteins it needs. When it was independent, it belonged to the kingdom ___.