Scientists aren’t exactly sure, but research points to a complex (33) ______between genes and environment While no exact set of “leftie genes” have been discovered, people who dominantly use
Scientists aren’t exactly sure, but research points to a complex (33) ______between genes and environment While no exact set of “leftie genes” have been discovered, people who dominantly use their left hands do have more left-handed family members.
A. collaborate
B. collaboration
C. collaborating
D. collaborated