Answer:
<u><em>Ancestors</em></u>
Explanation:
Ancestors can be described as the persons from which a particular human being originated. In a broader perspective, it is referred to family history of a person. Scientists believe that all organisms on Earth originated from a common ancestor which were the prokaryotes. The prokaryotes with time gave rise to the eukaryotes. Common descent is the phenomenon in which organisms having common ancestors are referred.
One electron is transferred in the ionic bond because sodium needs to lose one electron and chlorine needs to gain one electron to have a full energy shell, which is the ultimate goal in any bond.
Brainliest please :)