Microscopic plant life is at the base of the marine food web and is the primary food and energy source for the ocean ecosystem.
(Microscopic plant life; is; at the base of the marine food web) (Microscopic plant life; is; the primary food and energy source for the ocean ecosystem)
Microscopic plant life Microscopic plant life
is is
at the base of the marine food web
the primary food and energy source for the ocean ecosystem