Answer:
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A nucleus. Hope this helps.
An under water volcano is called a submarine valcano
Very powerful microscopes were needed before cells could be observed in detail
Answer:
C. Organisms are now divided into three kingdoms.
Explanation:
In the early 1860s, a German scientist named Ernst Haeckel suggested using a three kingdom system of classification. Haeckel's three kingdoms were Animalia, Plantae, and Protista.