Explain why mitochondrial DNA mutates at a faster rate then our DNA

Explanation:

The mutation rate in mtDNA is ten times higher than in nuclear DNA because mtDNA are subject to damage from reactive oxygen molecules released as a byproduct during OXPHOS. In addition, the mtDNA also lacks the DNA repair mechanisms found in the nucleus.

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the cell is the smallest structural and functional unit of living organisms, which can exist on its own. therefore, it is sometimes called the building block of life. some organisms, such as bacteria or yeast, are unicellular—consisting only of a single cell—while others, for instance, mammalians, are multicellular.