Answer:
These homologous structure indicates a common ancestry
Explanation:
When 4 organisms show homologous structures, they indicates they belongs to a common ancestor from where the changes takes place in them.
The organs which are structurally dissimilar but functionally same are called as homologous organism.
The answer is C
That is the only one they have in common.
That would be the nucleus.
The nucleus is the control center of the cell, located in the center of a cell.
UGCGAUGCUC I believe