Single-celled organisms are "generalists" and must perform all the functions performed by many "specialists".
(Single-celled organisms; are; generalists) (Single-celled organisms; must perform; all the functions performed by many "specialists") (all the functions; performed; by many "specialists)
Single-celled organisms Single-celled organisms all the functions
are must perform performed
generalists
all the functions performed by many "specialists"
by many "specialists