A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. Mutations range in size; they can affect anywhere from a single DNA building block (base pair) to a large segment of a chromosome that includes multiple genes.
MARK ME BRAINLIEST PLEASE!!!!
Answer:
D water. (so sorry if it's wrong)
Biological investigate useful DNA test. Lab test.blood test etc