Which of the following best describes a change in the sequence of DNA of an organism? A mutation
B natural selection
C gender
D DNA

DNA is a dynamic and adaptable molecule. As such, the nucleotide sequences found within it are subject to change as the result of a phenomenon called mutation. Depending on how a particular mutation modifies an organism's genetic makeup, it can prove harmless, helpful, or even hurtful.

Mutation (A)

answer; polycythemia is the correct answer;

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .