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Answer:
<h2>Nuclues</h2>
Prokaryotes lack a defined nucleus (which is where DNA and RNA are stored in eukaryotic cells), mitochondria, ER, golgi apparatus, and so on. In addition to the lack of organelles, prokaryotic cells also lack a cytoskeleton.
Explanation:
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A volcanologist studies volcanoes.
a biologist studies life.
a meteorologist studies meteors.
a chemist studies chemicals
Cereologists investigate crop circles.