New Research on Identical Twins Suggests That

Multiple Choice

New research on identical twins suggests that

A) duplicated or missing blocks of DNA can exist in one identical twin but not the other.
B) they are no more alike genetically than any other two siblings.
C) they can develop when a woman's ovaries release two eggs instead of one and each egg is fertilized by a different sperm.
D) they can be born several years apart.