Eukaryotes can be either single or multi celled. Prokaryotic cells do not have a nucleus or any membrane-bound organelles.
I hope this helps!
Troposphere is what I think it is.
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.
