Everyday Science MCQs Biology
Q “lubb” sound is produced due to___________________?
  • A A. Opening of inlet valve
  • B B. Closure of inlet valve
  • C C. Opening of outlet valve
  • D D. Closure of outlet valve
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Word of the Day
12 Jul
Obdurate
stubbornly refusing to change one’s opinion or course of action.
ضدی، بدکار، سنگدلی

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