Process A likely describes a photosynthesis whilst process B describes respiration.
In eukaryotic cells the DNA can be found in the nucleus mainly. so DNA replication takes place in the nucleus during the S phase of the cell cycle.
Also in eukaryotic cells there are mitochondria and chloroplasts (plants) and these have circular DNA and they also get replicated (according to their own mechanism).
Prokaryotic cells don't contain a nucleus. They do not contain DNA in the cytoplasm and thus the DNA replication will take place here.
I really hope this helps!
B! The strongest characteristics will survive when the weak ones won't
I think tracheae which is B not sure tho
Mitochondria by using cellular respiration to make ATP
