Question

1. Much of these organisms serve as food sources for bigger organisms, like fish.  2. Marine phytoplankton also fixes about half the carbon dioxide that gets released into Earth's atmosphere.  3. For this reason, some have suggest manipulating plankton to stem global warming.

A Only 2
B Only 1 and 2
C Only 1 and 3
D Only 2 and 3
E All 1, 2 and 3
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