PLSSSS HELP ME

In the year 1991 there were
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7 liters
of Phytoplankton and
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3000 m2
Zebra Mussels. In the year 1997 there were
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Phytoplankton and
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Zebra Mussels in the Hudson River. In 2003 there were
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of Phytoplankton and
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Zebra Mussles in the river. In 2009 there were
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of Phytoplankton and
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Zebra Mussels in the Hudson River.