Question

Mitochondria and chloroplasts of eukaryotic cells share many similarities with bacterial cells: what does this suggest?

Answer 1

Mitochondria and chloroplasts were once primitive bacterial cells.

This evidence is described in the endosymbiotic theory.

Symbiosis occurs when two different species benefit from living and working together.

When one organism actually lives inside the other it's called endosymbiosis.

The endosymbiotic theory describes how a large host cell and ingested bacteria could easily become dependent on one another for survival, resulting in a permanent relationship.