This is the amount of material ( biomass ) made available each year by the photosynthetic organisms, or primary producers , that can be used as food for all other living organisms, the grazers and predators at various trophic levels up the food chain, including humans.
(This; is; the amount of material ( biomass ) made available each year by the photosynthetic organisms, or primary producers , that can be used as food for all other living organisms, the grazers and predators at various trophic levels up the food chain, including humans) (the amount of material ( biomass ) made available each year by the photosynthetic organisms, or primary producers; can be used; as food)
This the amount of material ( biomass ) made available each year by the photosynthetic organisms, or primary producers
is can be used
the amount of material ( biomass ) made available each year by the photosynthetic organisms, or primary producers , that can be used as food for all other living organisms, the grazers and predators at various trophic levels up the food chain, including humans
as food