in the 1960's mitochondria dna was discovered with the use of an electron microscope. the presence of mitochondrial dna in eukaryotic cells suggest what about the origin of life on earth
a. eukaryotic cells functions without dna
b. the dna molecule existed before mitochondria
c. mitochondria may have been free-living cells (endosymbiotic theory)
d. that life originated from mitochondrial dna
