Biology
Which of the following organisms fix nitrogen in aquatic ecosystems

Fungi
Phytoplankton
Cyanobacteria
Chemoautotrophs

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Biology
Which of the following is not true of colour blindness?

Colour blind people learn to rely on shapes, patterns, and positions of signs and signals
A colour blind person cannot see any colours
For some people, it might be difficult to recognize colours of traffic lights and signs
Red-green colour blindness is the most common type of colour blindness

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