Fact 1: Mutations are essential for evolution to occur. Fact 2: Mutations are changes in the DNA sequence. Given the two facts above, what is essential for evolution to occur?
Possible answers: [I] Changes in DNA sequences; [II] Plant reproduction; [III] Natural disasters; [IV] Gamma radiation; [V] biological diversity; [VI] DNA sequences staying the same; [VII] the environment; [VIII] that material's properties;
[I]