This food chain is incomplete. two groups of organisms are missing. one group of organisms that is missing are the producers, plants and other photosynthetic organisms. they turn sunlight into chemical energy. what is the other missing group and what do they do? a) carnivores that eat only meat. b) herbivores that eat only plants. c) predators that prey on all other levels of consumers. d) decomposers that recycle matter back into the food chain.