A mutation occurs when a base in the DNA sequence is replaced by a different base.

Missense Mutation

Explanation:

The types if mutations include: Missense mutation. This type of mutation is a change in one DNA base pair that results in the substitution of one amino acid for another in the protein made by a gene. An insertion changes the number of DNA bases in a gene by adding a piece of DNA.

Substitution

Explanation:

A substitution mutation occurs when a base in the DNA sequence is replaced by a different base.

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when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.