I believe the answer is comparative anatomy. It is the study of the similarities and differences in the structures of different species. Similar body parts may be homologies or analogies, such that both provide evidence of evolution. Similarities in embryos are evidence of common ancestry. For example all vertebrates embryos have gill slits and tails.
Mitochondria, plastids and chloroplast all are surrounded by a double membrane
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Thin bodies.. The keyword is flatworm.
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Answer: the answer is the last one transcription takes place on the nucleus and translation takes place in the cytoplasm
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