Context: Molecular studies based on DNA analysis have suggested new relationships among mammal families over the last few years. Most of these findings have been independently validated by retrotransposon presence/absence data. Classification systems based on molecular studies reveal three major groups or lineages of placental mammals- Afrotheria, Xenarthra, and Boreoeutheria- which diverged from early common ancestors in the Cretaceous. The relationships between these three lineages is contentious, and all three possible different hypotheses have been proposed with respect to which group is basal with respect to other placentals. These hypotheses are Atlantogenata (basal Boreoeutheria), Epitheria (basal Xenarthra), and Exafroplacentalia (basal Afrotheria). Boreoeutheria in turn contains two major lineages- Euarchontoglires and Laurasiatheria.

Question: Through Molecular studies, what was used to suggest new relationships among mammal families?
Answer: DNA analysis

Question: During these Molecular studies, which three major groups of mammals shared a common ancestors from the Cretaceous period?
Answer: Afrotheria, Xenarthra, and Boreoeutheria

Question: Afrotheria,Xenartha, and Boreoeutheria deprives from which two lineages?
Answer: Euarchontoglires and Laurasiatheria

Question: What have studies based on Boreoeutheria suggested?
Answer: Unanswerable

Question: What have findings based on common ancestors in the Cretaceous been validated by?
Answer: Unanswerable

Question: What are three major groups of Laurasiatheria?
Answer: Unanswerable

Question: Where did Euarchontoglires and Laurasiatheria come from?
Answer: Unanswerable

Question: What two major common ancestors does Alantogenata contain?
Answer: Unanswerable