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Which organism would be classified as a producer based on this food web?

"USGS Circular 1316 Chapter 14: Changes in Food and Habitats of Waterbirds." USGS Circular 1316 Chapter 14: Changes in Food and Habitats of Waterbirds. United States Geological Survey, n.d. Web. 23 Mar. 2016. http://pubs.usgs.gov/circ/circ1316/html/circ1316chap14.html.

A

Gulls.

B

Bivalves.

C

Phytoplankton.

D

Benthic Invertebrates.

E

Geese.

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