Which of the following constitute a food-chain? (a) Grass, wheat and mango (b) Grass, goat and human, (c) Goat, cow and elephant (d) Grass, fish and goat,
Which of the following constitute a food-chain?
(a) Grass, wheat and mango (b) Grass, goat and human,
(c) Goat, cow and elephant (d) Grass, fish and goat,