I want to Say A - I searched google and it said that Archaea has something called membrane lipid bonding, ( which is oils and fat ) I didn't see anything about nucleus, size, or cell wall.
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The answer on this scenario would be that most of the people would rely on external brains these days in order to connect to people.Hope this would be the answer on this question and would surely be of help then.
Answer:
I think it's b because the earth's magnetic field had drastically changed shape and direction in the shape
The best answer i believe is b. Sequencing