<P> Primary producers are organisms in an ecosystem that produce biomass from inorganic compounds ( autotrophs ) . In almost all cases these are photosynthetically active organisms ( plants , cyanobacteria , protists and a number of other unicellular organisms ; see article on photosynthesis ) . However , there are examples of archaea and bacteria ( unicellular organisms ) that produce biomass from the oxidation of inorganic chemical compounds ( chemoautotrophs ) in hydrothermal vents in the deep ocean . These organisms are considered to exist at the lowest trophic level . </P>
<P> Primary producers are organisms in an ecosystem that produce biomass from inorganic compounds ( autotrophs ) . In almost all cases these are photosynthetically active organisms ( plants , cyanobacteria , protists and a number of other unicellular organisms ; see article on photosynthesis ) . However , there are examples of archaea and bacteria ( unicellular organisms ) that produce biomass from the oxidation of inorganic chemical compounds ( chemoautotrophs ) in hydrothermal vents in the deep ocean . These organisms are considered to exist at the lowest trophic level . </P>
where would a primary producer be located in a food chain
where would a primary producer be located in a food chain
the lowest trophic level
the lowest trophic level