These "primary producers," i.e. algae and some bacteria, exist at the lowest levels of the food chain and use sunlight or chemical energy, rather than other organic material, as sources of energy.
(These "primary producers; exist; L:at the lowest levels of the food chain) (These "primary producers; use; sunlight or chemical energy, rather than other organic material)
These "primary producers These "primary producers
exist use
L:at the lowest levels of the food chain
sunlight or chemical energy, rather than other organic material