Answer:
P wave
Explanation:
Electrocardiogram records the strength and timing of electrical activity in heart. As various regions of heart contract at different times and for different duration, the electrical activity is not constant and shows a series of rise and fall. There are three main components of ECG: P wave, QRS complex and T wave.
P wave indicates the beginning of electrical signal in the right atrium. The signal spreads in both right and left atria which leads to their contraction. As a result, blood is pumped into the ventricles and rest of the process occurs.
How does a new hypothesis replace an older explanation of something in the natural world? To understand this let us look at one of the classical example of geocentric theory and heliocentric theory. The geocentric theory states the Earth is at the centre of the solar system and the Sun, Moon, and all the other planets revolve around it. This ancient theory failed to explain the phenomenon like the phases of Moon, solar eclipse and lunar eclipse. The modern heliocentric theory which states that the Sun is at the centre of solar system, and all the planets including the Earth revolve around it. This theory was able to explain all the phenomenons unlike the geocentric theory. Hence the heliocentric theory replaced the geocentric theory.
The process of Cellular respiration
This is called mutualism. hope this helpes
Cartoons such as this one took the position that deportation was necessary because assimilation programes in the united states was unsucsseful.
<h3>
What is assimilation programes?</h3>
To ensure the long-term success of immigrants and their offspring as well as to maximize the advantages of immigration, assimilation is crucial. According to recent studies, immigrants in this day and age are assimilating effectively.
Assimilation is happening quickly in the United States, according to a massive 520-page literature review by the National Academy of Sciences, but some of those gains are obscured by a phenomenon known as "ethnic attrition.
Numerous OECD studies reveal that, even when it comes to job matching, immigrants and their offspring are more economically integrated in the United States than they are in other affluent nations.
Therefore, Cartoons such as this one took the position that deportation was necessary because assimilation programes in the united states was unsucsseful.
To learn more about cartoons, refer to the link:
brainly.com/question/24144273
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