https://www.vedantu.com/question-answer/in-the-normal-ecg-the-negative-waves-are-a-pqrs-class-11-biology-cbse-5f67fc1eb12a162d4ff4ed88
In the normal ECG the negative waves are a PQRS b PRT c QS d XYZ
normal ecgnegative wavespqrs
https://www.enn.com/articles/50686-concurrent-heat-waves,-air-pollution-exacerbate-negative-health-effects-of-each
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environmental newsheat wavesair pollutionnetworkconcurrent