Answer: The correct answer would be the fourth option.
Explanation:
Water is a chemical compound formed from oxygen and hydrogen. Its chemical formula is H₂O. It is polar inorganic compound. It is essential for life as life would not be possible without water. It helps in stabilizing the global temperature as well as body temperature of living organisms.
However, it is not the most abundant molecule in the atmosphere. The nitrogen is the most abundant gas present in the atmosphere which nearly makes 78 percent of the atmosphere. The water vapours hardly makes 1 percent of the atmosphere.
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QRS complex refers to the combination of the Q, R, and S waves, and indicates ventricular depolarization and contraction (ventricular systole).
Ventricular rate can be calculated by determining the time interval between QRS complexes. The duration of the QRS complex is normally 0.06 to 0.10 seconds. This relatively short duration indicates that ventricular depolarization normally occurs very rapidly.
P QRS and T waves in electrocardiogram signifies the P wave in an ECG complex indicates atrial depolarization. The QRS is responsible for ventricular depolarization and the T wave is ventricular repolarization.
To learn more about ventricular depolarization , here
brainly.com/question/10577559
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