All Y chromosomes in existence today are descended from a single ancestor's who is thought to have lived about 140,000 years ago. Select one of the following answer choices A a single ancestor"s who is thought to have lived B a single ancestor"s who was thought to live C a single ancestor whom it is thought had lived D the Y chromosome of a single ancestor who is thought to have lived E the Y chromosome of a single ancestor whom it was thought had lived Submit Log in or register to post comments