Which of these cellular structure did would be found in all living cells across all domains on earth and can indicate common ancestry

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

for a different answer set the answer would be because the oxygen in the water had depleted (apex)