Identify the correct sequence of organisms in food chain. A. Barnacle Larva B. Diatoms C. Herring D. Arrow Worm Choose the correct answer from the options given below:
B, A, D, C
The food-chain sequence is diatoms → barnacle larvae → arrow worms → herring, or B–A–D–C. Diatoms are primary producers; the succeeding organisms represent consumers at progressively higher trophic levels in this simplified chain.