3 paragraph
Since most seagrass systems _________are depositional environments,
they eventually __________accumulate
organic material
that _________leads to the creation
of fine-grained sediments
with a much higher organic content
than that of the surrounding unvegetated areas.
This accumulation, in turn, ____________reduces
the water movement and the oxygen supply.
The high rate of metabolism
(the processing of energy for survival)
of the microorganisms
in the sediment
_________causes sediments
to be anaerobic
(without oxygen)
below the first few millimeters.
According to ecologist J.W. Kenworthy,
anaerobic processes
of the microorganisms
in the sediment
___________are an important mechanism
for regenerating
and recycling nutrients and carbon,
ensuring the high rates of productivity
---that _________is, the amount of organic material produced---
that __________are measured
in those beds.
In contrast
to other productivity in the ocean,
which __________is confined to various species of algae
and bacteria __________dependent on nutrient concentrations
in the water column,
seagrasses _________are rooted plants
that absorb nutrients
from the sediment or substrate.
They _______are, therefore,
capable of recycling nutrients
into the ecosystem
that would otherwise __________be trapped
in the bottom
and _________rendered unavailable.
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