Final answer:
Vitamin A and Vitamin C prevent the formation of thymine dimers, which can damage DNA.
Step-by-step explanation:
Vitamin A and Vitamin C prevent the formation of thymine dimers, which can damage DNA. Thymine dimers are formed when adjacent thymines in a single DNA strand are exposed to UV radiation, causing covalent bonds to form between them. This can lead to replication errors and mutations. Vitamin A and C act as antioxidants, neutralizing free radicals that can cause DNA damage.