HELP INDEX NEXT UP PREVIOUS FEEDBACK ATG Cell Development

An individual organism, by definition, must have some boundary or wall which describes its "self". These structures occur naturally in non-living things: geodes, cavities, caves, bubbles. Logically single cells must have evolved before more complex organisms. As organisms developed the reservoir of cellular material became more organized, the DNA residing in a nucleus, the "digestive system" in organelles called mitochondrians. [NS] {NR}
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