It might be C but dont quote me on that
The answer is; E
This shows that these organelles were once free-living organisms with their own mechanisms for reproduction which they have retained even after years of symbiotic relationship with the higher organisms. During their duplication, they also replicate their own DNA. Their DNA does not have histones (as opposed to the DNA in the nucleus of their host eukaryotic cell) similar to that of simple organisms such as bacteria.
Sex is important because its how we reproduce we create new life so that they can create new life and so on with out sex theres no life if that makes sense
1) Chloroplast
-converts solar energy into food for the plant.
2) Cell Wall
-provides protection and structure.