how was the first cell formed with detail
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New cells are formed from preexisting cells through mitosis. Sexually reproducing organisms also create a type of cell, called a gamete, through meiosis. ... The replication of DNA is needed in order to maintain the number of chromosomes of the parent cell (original cell) after the cell divides.
Cells are divided into two main classes, initially defined by whether they contain a nucleus. Prokaryotic cells (bacteria) lack a nuclear envelope; eukaryotic cells have a nucleus in which the genetic material is separated from the cytoplasm. Prokaryotic cells are generally smaller and simpler than eukaryotic cells; in addition to the absence of a nucleus, their genomes are less complex and they do not contain cytoplasmic organelles or a cytoskeleton .