The correct option is A.
Scientists have proposed many hypothesis to explain how life originate on earth. One of these hypothesis is that of replicating RNA. The hypothesis holds that, self replicating RNA, that exist in the ocean in the early period of the earth are the one who gave rise to the DNA molecules that are found in living organisms today.
Correct answer: A). Self-replicating RNA in the early Earth's oceans served as the basis for the DNA in cells today.
The hypothesis for the origin of life on earth was known to be started from prokaryotes when the first cell is known to be made under the suitable conditions, and presence of starting material in the atmosphere to form the first cell.
The unicellular cell evolved and engulf other cells to form more complex cells known as eukaryotic cells.
Example: Chloroplast and mitochondria
