A unique feature of the nucleus is that it disassembles and re-forms each time most cells divide. At the beginning of mitosis, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down, resulting in the release of most of the contents of the nucleus into the cytoplasm.
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Hmmm.....firstly it depends which grade ur in....well in general I am ready
Answer:
Aves is a class of vertebrates that comprises the birds' species.
1. Archiornithes
2. Neornithes
I would need more information to answer this question