---------------------------------------------------------------- Deserts and semi-deserts are characterized as ecosystems of low primary productivity, but a more pertinent trait is the variability of plant production in space and time.
(Deserts and semi-deserts; are characterized; as ecosystems of low primary productivity) (a more pertinent trait; is; the variability of plant production in space and time)
Deserts and semi-deserts a more pertinent trait
are characterized is
as ecosystems of low primary productivity
the variability of plant production in space and time