Which mutation occurs when one nucleotide base is replaced with another base

The correct answer is a substitution mutation.  

A mutation, which substitute’s one base for another, that is, a change in a solitary chemical letter like switching an A to a G is known as a substitution mutation. This kind of substitution can modify a codon to something, which encrypts a distinct amino acid and leads to a small modification in the generated protein.  

the dna of humans and mice is almost 92% similar. this similarity indicates that . mice have a tail, while humans have a tailbone. the tailbone is a structure in humans.yes it's true.