A change in a gene due to damage or incorrect copying is called
a evolution.
c. segregation.
b. meiosis.
d. a mutation.

Option D). a mutation.

Explanation:

Mutation is the change in the genetic composition of the cell. This change in a gene can be due to

- spontaneous change in nitrogenous base

- error during replication i.e incorrect copying of DNA template strand

- damage to DNA by ionizing radiation such as X-rays

- damage to DNA by heavy metals such as cadmium, lead etc

Thus, mutation is the answer.

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b brown mice / white sand dunes