Most species of cyanobacteria are enclosed in a
carotenoid pigment
phycoerythrin
mucilaginous sheath
nuclear membrane

mucilaginous sheath

Cyanobacteria are microorganisms that have survived for a thousand years now. They process and create their food through the photosynthetic mechanisms they possess and this process also includes nitrogen fixation and other biogeochemical process that contributes to most cycles.