Which one is the correct food chain?

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Eagle - snake- grasshopper- grass- frog

Frog- snake- eagle- grasshopper- grass

Grasshopper- grass- snake- frog- eagle

Grass- grasshopper- frog- snake- eagle

answer is D.

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Detailed Solution

Concept: In a food chain, producers start the chain, after which the subsequent trophic levels are positioned.
A food chain is a linear network of trophic levels that begins with producer creatures and typically ends with predator species, though detritivores or decomposer species can also be found there. The food chain can be viewed as a schematic of an energy source; it starts with a producer and ends with a primary consumer. A secondary consumer then consumes the primary consumer, who is then eaten by a tertiary consumer. For example a primary consumer in a food chain can be a snail that eats a green plant as the producer.
The frog, for example, will eat the snail before being devoured by a snake, the tertiary consumer, who will then swallow the frog.
Hence, the correct answer is option 4.

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