Answer:
1.b and 2.A
this made my head hurt im so sry if incorrect
Explanation:
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The p wave on an electrocardiogram (ecg) represents the depolarization of cells in the sinoatrial (SA) node.
<h3>What is sinoatrial node?</h3>
The sinoatrial node is close to the opening of the superior vena cava. This bundle of nerve tissue propagates electrical impulses and therefore governs sinus rhythm from minute to minute.
Electrocardiogram is a test, it is possible to detect the rhythm of the heart and the number of beats per minute.
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I believe heterotrophs are organisms that get their energy by eating other organisms. These organisms are also called predators
Water, Sunlight energy, and CO2(carbon dioxide)
Answer:
cause disease and cause algal blooms