Question

which types of twins have the same dna, and are valuable in studying the influence of environmental factors on genetics? dizygotic fraternal monozygotic female

Explanation:

Monozygotic twins develop from a single fertilized egg that splits, so they have identical DNA. This makes them valuable for studying how environmental factors affect genetics as the genetic background is the same. Dizygotic twins come from two separate eggs fertilized by two separate sperm and have different DNA like regular siblings. Fraternal is another term for dizygotic. Female is just a gender - not relevant to DNA identity in twins.

Answer:

monozygotic