1) Do in tandem 2) Do together 3) Interrelate 4) Move 5) Perform as one 6) To do or act together 7) Work in concert 8) Work together 9) Worth with 
• (v. i.) To act together; to work in concert; to unite. • (v. t.) To force; to compel; to drive.
Co·act' intransitive verb [ Prefix co- + act , intransitive verb ] To act together; to work in concert; to unite. [ Obsolete] « But if I tell you how these two did coact . Shak. » Co·act' transitive verb [ Latin coactare , intens. from cogere , coactum , to force. See Cogent .] To force; to compel; to drive. [ Obsolete] « The faith and service of Christ ought to be voluntary and not coacted . Foxe. » 
[v] - act together, as of organisms
verb act together, as of organisms
to do or act together.