prokaryotic cells first appeared on earth approximately 3.5 billion years ago.
prokaryotic cells first appeared on earth approximately 3.5 billion years ago.
when did prokaryotic cells first appear on earth?
approximately 3.5 billion years ago
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there are two fundamental classifications of cells: prokaryotes and eukaryotes. the major difference between the two is the presence or absence of organelles. other factors such as size, the way in which they reproduce, and the number of cells distinguish them from one another. eukaryotic cells include animal, plant, fungi, and protozoa cells which all have a nucleus enclosed by a membrane, with various shapes and sizes. prokaryotic cells, lacking an enclosed nucleus, include bacteria and archaea. prokaryotic cells are much smaller than eukaryotic cells, making prokaryotic cells the smallest form of life. cytologists typically focus on eukaryotic cells whereas prokaryotic cells are the focus of microbiologists, but this is not always the case.
cell biology