Biology
Which of the following organisms fix nitrogen in aquatic ecosystems

Chemoautotrophs
Fungi
Cyanobacteria
Phytoplankton

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Biology
Which is not a function of the cell membrane?

Keeps materials within the cell separated from the environment outside the cell
Helps control the movement of materials into and out of the cell
Helps substances pass from the cytoplasm into the nucleus
Allows the cell to change shape under pressure

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