Solution

• Grasshopper (D - 1st trophic level): Grasshoppers are primary consumers as they feed directly on plants (producers).
• Snake (A - 3rd trophic level): Snakes are secondary or tertiary consumers as they prey on organisms like frogs or rodents.
• Frog (B - 2nd trophic level): Frogs are secondary consumers, feeding on insects (primary consumers).
• Hawk (C - 4th trophic level): Hawks are apex predators at the top of the food chain, feeding on snakes or other secondary/tertiary consumers.