Their difference is that Eukaryotes posses nucleus & nuclear bound organelles whereas prokaryotes doesn't!
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The eardrum is a thin flap of skin that is stretched tight like a drum and vibrates when sound hits it.
Answer:
<h3>Biologists study humans, plants, animals, and the environments in which they live. They may conduct their studies--human medical research, plant research, animal research, environmental system research--at the cellular level or the ecosystem level or anywhere in between.</h3>