Answer & Explanation:
Producers are usually autotrophs such as green plants. Green plants produce organic matter and energy on their own in the presence of light with water and carbon dioxide through photosynthesis.
Primary consumers depend on the producers for their energy and food. Primary consumers eat producers and get their energy such as deer.
Decomposers are organisms that decompose or decaying organisms or break down organisms and during breaking down dead, they carry out the natural process of decomposition.
Hope this helps! ^_^