Answer:
Producer, decomposer, herbivore, carnivore
Step-by-step explanation:
1. A single tree would be considered a producer because it produces the food needed for mammals to consume.
2. A rotten fruit lying on the grass would be considered a decomposer because it is food that is decomposing in the environment.
3. Two deer on a field represent herbivores because they only eat plants, not animals.
4. A cheetah represents a carnivore because it only eats meat, not plants.