1. Nitrogen Fixation Cyanobacteria can change atmospheric N2 into NO3-.
Primary producers need NO3-
Very important job

2. Stromatolites One species of cyanobacteria form complex mounds
Up to 1 meter high

3. Kingdom Protista: The Unicellular Algae [Algae (pl) Alga (s)]
Simple, eukaryotic organisms that live in water
Hard to categorize
Plant-like (unicellular) and animal-like (multicellular)
Various colors
NO true leaves, stems or roots
NO flowers
Some have flagella and swim
Unicellular to Multicellular
Euglena

4. Unicellular, Plant-like Protista: Phytoplankton-
Photosynthetic organisms that drift in the water

5. Diatoms Extremely plentiful phytoplankton
Especially in temperate waters
Greatest producers of oxygen on the earth
Silicon dioxide makes up their cell wall= frustule
Glassy shell is made of 2 pieces; like a box and lid.
Frustule settles to the bottom after organism dies forming thick deposits.