Although each ecosystem has unique plants and animals living there, some species, like plankton, are common to all ecosystems in varying degrees.
(each ecosystem; has; unique plants and animals living there) (unique plants and animals; living; L:there) (some species; are; common to all ecosystems in varying degrees)
each ecosystem unique plants and animals some species
has living are
unique plants and animals living there
L:there
common to all ecosystems in varying degrees