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Which of the following is NOT a valid food chain, as it lacks a proper predator-prey feeding relationship in sequence?

Question
Which of the following is NOT a valid food chain, as it lacks a proper predator-prey feeding relationship in sequence?
Grass -> goat -> human
Grass -> deer -> tiger
Grass, wheat and mango (with no feeding relationship stated)
Aquatic plants -> small fish -> big fish
Answer
Grass, wheat and mango (with no feeding relationship stated)
Detailed Explanation
Grass, wheat, and mango, without a stated feeding relationship connecting them in sequence, do not form a valid food chain. — Examisthan.com
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