Earlier biologists consider the symbiotic origin of eukaryotic organelles a radical idea because it was against the traditional evolution theory and there was little evidence about it.
Eukaryotic organisms differ from prokaryotic ones due to specialized structures known as organelles.
The symbiotic origin of organelles suggests these structures first emerged when one smaller prokaryotic cell was ingested by a bigger one and over time the ingested cell.
There are two main reasons why this theory was controversial.
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