Consider this: Inherited traits that enable their bearers to live long enough to pass them on to the next generation are the traits that survive in a population.
(the traits; survive; L:in a population) (Inherited traits; enable; their bearers; to live long enough to pass them on to the next generation) (their bearers; to live; T:long enough to pass them on to the next generation) (Inherited traits that enable their bearers to live long enough to pass them on to the next generation; are; the traits that survive in a population)
the traits Inherited traits their bearers Inherited traits that enable their bearers to live long enough to pass them on to the next generation
survive enable to live are
L:in a population
their bearers to live long enough to pass them on to the next generation
T:long enough to pass them on to the next generation
the traits that survive in a population