10. CYANOBACTERIA
They are autotrophic organisms
They are commonly found in fresh water
or marine environments and on land
Their cell walls are made up of
peptidoglycan, which is poisonous to
grazers
11. CYANOBACTERIA
Can exists as unicellular, colonial or
filamentous
Some cyanobacteria can fix nitrogen
because of heterocyst, thick walled cells
which contain the enzyme nitrogenase used
to convert nitrogen gas to ammonia