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.
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A. A genetically engineered crop that is resistant to insect pests could also harm helpful insects.
B. Crops can be genetically engineered to have useful traits that are not found in wild populations,
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Changing energy to clean energy. This solution gave me some hope because we would stop using non-renewable resources, which are harmful to the environment.