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Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?

(a) Level PC is insects and level SC is small insectivorous birds.

(b) Level PP is phytoplanktons in sea and whale on top level TC

(c) level one PP is pipal trees and the level SC is sheep

(d) Level PC is rats and level SC is cats 

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