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Long ago, scientists did not know that cells existed because A) they did not have microscopes. B) they were too busy studying plants. C) they were not allowed to do research on animals. D) they were studying the sun and the planets instead.

User Costrouc
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2 Answers

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The correct answer is a

User Gravitoid
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5 votes
A.
I Believe, sorry if I am wrong.
User MuTaTeD
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