The stomach <span>walls have a lining that contains epithelial cells that have a protective layer of mucus and bicarbonate. The mucous is pretty much the same stuff which lines our throat and nose.</span>
Answer: Only a single codon in the gene sequence is changed in base substitution mutation. Although a base substitution alters only a single codon in a gene, it can still have a significant impact on protein production.
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during the tadpole stage, they relie on the oxygen in the water to live, unlike frogs in the adult stage who can use the oxygen in the air on land
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