They lack genetic material. They lack a mechanism of motility. They lack internal membrane-bound organelles. They lack a need for proteins in their life functions.
Which property supports the hypothesis that eukaryotic mitochondria were once prokaryotic organisms?

Options:
- They lack genetic material.
- They lack a mechanism of motility.
- They lack internal membrane-bound organelles.
- They lack a need for proteins in their life functions.

They lack internal membrane-bound organelles.