Final answer:
The correct answer is option D. Snail - Algae - Kingfisher - Frog.
Step-by-step explanation:
The correct answer is option D. Snail - Algae - Kingfisher - Frog. In a food chain, organisms are linked together based on their feeding relationships. The sequence of the food chain should start with a producer (plants or algae), followed by primary consumers (herbivores), then secondary consumers (carnivores that eat herbivores), and finally tertiary consumers (carnivores that eat secondary consumers).
In option D, the sequence is incorrect because it starts with a snail, which is a primary consumer, before the producer (algae). The correct sequence should be Algae - Frog - Kingfisher - Snail.
Therefore, option D is the food chain that is not sequenced correctly.