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.
Mitosis is the process of cell division that creates a new cell identical to the original. Somatic cells, such as muscles, hair and skin, undergo mitosis regularly in humans and other organisms. This is an important type of cell division needed to facilitate the repair of damaged cells, growth and replacement of old cells with new ones.
When a new cell is created, it must have the same library of genetic information all other cells in the body have access to. Because all the material in the new cell must come from the first cell, the original cell must make a copy of its DNA before completing the process of mitosis. These two sets of DNA only exist for as long as it takes the cell to undergo mitosis, which can be anywhere from 30 to 90 minutes in certain human cells. When the cell division is complete, both of the cells have a single identical copy of DNA.
Answer:
d. furcula
Explanation:
Furcula
Furcula is a synapomorphy linking dinosaurs and birds .
The furcula is the structure formed by midline fusion of clavicles and this very element is unique in the theropods as well . And is the most crucial for understanding the link between birds and the theropods .
The first suggestion was by Huxley in 1868 , and in 1870 , the key component of the debate is the presence of Frucula .
The digestive process, inside the small intestine.
