Which best describes a genetic mutation?
A. a random change to an organism's DNA
B. a condition that shortens an organism's lifespan
C. a trait that an organism inherits from its parents
D. a building block of an organism's genetic code
A. a random change to an organism's DNA
B. a condition that shortens an organism's lifespan
C. a trait that an organism inherits from its parents
D. a building block of an organism's genetic code