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(C) Statement $A$ is incorrect: Removal of $80\%$ tigers (tertiary consumers) leads to an increase in herbivores (primary consumers),which in turn cau

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$B, C$

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(C) Statement $A$ is incorrect: Removal of $80\%$ tigers (tertiary consumers) leads to an increase in herbivores (primary consumers),which in turn causes overgrazing and decreased vegetation growth.Statement $B$ is correct: Carnivores regulate the population of herbivores (like deer). Their removal leads to an unchecked increase in the deer population.Statement $C$ is correct: According to the $10\%$ law of energy transfer,energy loss at each trophic level is significant,limiting the length of food chains to typically $3-4$ trophic levels.Statement $D$ is incorrect: Food chains are generally short and do not typically reach $8$ trophic levels due to the drastic reduction in available energy.Therefore,statements $B$ and $C$ are correct.

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