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In a grassland, all the snakes are killed by people. What is most likely to happen first?
Why do the number of herbivores in a forest not keep increasing year after year, even when there is plenty of grass?
A farmer sprays poison to kill all the frogs in his paddy field because they make noise. Using the food chain Paddy → Grasshopper → Frog → Snake, explain how this would affect (a) the paddy crop and (b) the snakes.
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