The organism which obtains energy directly from the producers only are herbivores.
Answer: herbivores
Step-by-step explanation:
Herbivores are the animals which eat the plants. Plants are the producers of the food chain and the food web. Animals like elephant, deer have their teeth to grind plants and its parts.
Therefore, herbivores are the organisms which take up their energy from the producers only. Other listed options as decomposers feed on dead and decayed organisms and comes last in the food chain.
Omnivores are humans who eat plants as well as other animals for energy requirements.