DNA Mutation is caused by the alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes. Thus, the correct answer is option D.
1.DNA Mutations are caused by environmental factors known as mutagens.
2.Types of DNA mutagens include radiation, chemicals, and infectious agents.
3.DNA Mutations may be spontaneous in nature.
<span>Your answer would be inadequate sunlight.</span>
Since people with HIV have weakened immune systems it would be:
C) People with HIV are unable to fight off these rare diseases.
The answer to your question is C
