It occurs in the first phase known as the Prophase. During this the chromosomes inside the cell’s nucleus condense to form tight structures.
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your answer to this response is
Solar Nebula. Our solar system began forming within a concentration of interstellar dust and hydrogen gas called a molecular cloud. The cloud contracted under its own gravity and our proton-Sun formed in the hot dense center. The remainder of the cloud formed a swirling disk called of the solar nebula.
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Faithrawlins14
Cochlea! It amplifies sound too