Answer:
2. Some of the early prokaryotic cells did not contain any DNA.
Step-by-step explanation:
Endosymbiosis is a theory that explains the origin of eukaryotic cells, which are cells that contain a nucleus and other membrane-bound organelles. According to this theory, eukaryotic cells evolved from a symbiotic relationship between different types of prokaryotic cells. One prokaryotic cell would engulf another, and over time, the engulfed cell would become an organelle within the host cell.