Answer:
Cyanobacteria are
unicellular prokaryotic organisms. Besides, some primitive cellular cell organelles,
they have photosynthetic lamellae where photosynthetic pigments are present.
There are chlorophyll-a c, phycocyanin and phycoerythrih.
These coloured
pigments impart typical blue green colour to the bacteria and enable them to
manufacture food for themselves and aquatic animals, Green plants are multi cellular
organisms capable of making food by using and light energy in
special cell organelles called chloroplast.
, So,
bacteria and green plants make food for living organisms on earth.
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