A) The population of P and Q decreased, while population of R and S increased.
B) P and Q adapted to warmer waters, face increasing competition tor 'roo6 from R and S.
C) R and S got adapted to warmer waters, face lesser competition from P and Q.
D) All the four species (P, Q, R and S) were unable to adapt to the chemical wastes.
Correct Answer: B
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