Answer: What's your answer?
Explanation:
Absorbing prokaryotic cells. This theory is called the endosymbiotic theory.
The early prokaryotic cells that were absorbed likely evolved into mitochondria and chloroplasts, membrane-bound organelles with their own DNA in single chromosomes and their own ribosomes.
Genetic diseases is one of the topics that will be covered in biology
Prokaryotic cells doesn't have a nucleus.