I believe you meant to say is this mistake called a base pair and if that is your question then no. it would be called Mutation. But you can double check that answer.
<h3>Answer:</h3><h3>Mitochondria and chloroplasts originated from the endosymbiotic association of aerobic (more...) A critical step in the evolution of eukaryotic cells was the acquisition of membrane-enclosed subcellular organelles, allowing the development of the complexity characteristic of these cells.</h3><h3>Hope this is fine for you
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Crowded between the collagen fibers are rows of fibroblasts, fiber-forming cells, that generate the fibers. Dense connective tissue<span> forms strong, rope-like structures such as tendons and ligaments.</span>