ANSWERS: 1
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Humans are at the top of the ocean's food web. If you're focusing just on marine inhabitants, the top of the ocean's food web is made up of marine mammals, like whales and dolphins, and large predator fish, like tuna, billfish and cod.
Source:
Teas A&M University: Marine Food Webs
"The World is Blue: How Our Fate and the Ocean's Are One;" Sylvia Earle and Bill McKibben; 2009
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