Free-living (non-symbiotic) bacteria, cyanobacteria (or blue-green algae) Anabaena and Nostoc. Mutualistic (symbiotic) bacteria such as Rhizobium, associated with leguminous plants.
Through photosynthesis and absorption from soil all living organisms enter the living form.
It is well known fact that all living organisms are made of elements like C, N, H, O...
(c) toxin is inactive:
In bacteria, the toxin is present in an inactive form, called prototoxin, which gets converted into active form when it enters the body of an insect.
