How is opening and closing of stomata controlled, Biology

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How is opening and closing of stomata controlled? Describe

a) Why is the length of a food chain in an ecosystem generally limited to 3 - 4 trophic levels? Explain with an example.

b) In what form do the terrestrial reptiles excrete their nitrogenous waste'? How this part of excretion is advantageous to the land vertebrates which Lay shelled eggs

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