Food chains follow producer-to-consumer sequence

Steps:

• Identify the producer: Plants make food via photosynthesis, starting all chains.
• Locate the primary consumer: Herbivores like rabbits eat plants.
• Find the secondary consumer: Carnivores or omnivores like dogs eat herbivores.
• Check sequence: Valid chains flow energy from producer to higher consumers without reversal.

Why D is correct:

• It follows the food chain definition: producer (plant) → primary consumer (rabbit) → secondary consumer (dog), transferring energy upward.

Why the others are wrong:

• A: Lacks a producer; all are consumers, breaking the chain start.
• B: Starts with consumer (dog) and includes plant mid-chain, reversing energy flow.
• C: Jumps from producer (plant) to secondary consumer (dog), skipping primary consumer (rabbit).

Final answer: D