Answer: The P wave indicates atrial depolarization. The P wave occurs when the sinus node, also known as the sinoatrial node, creates an action potential that depolarizes the atria. The P wave should be upright in lead II if the action potential is originating from the SA node.
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Algae and fungi do not have cell wall and many other organisms do not have a cell wall.You can check it out on google for more examples.
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rugae or gastric folds
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not totally sure but i think so
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Oxygen
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The formula for cellular respiration is oxygen + glucose -> water, carbon dioxide, energy. You can already cross out A and D because they aren't in the formula, so you have two left, water and oxygen. The reason why it is oxygen and not water is because without oxygen you can't even have water. also, I just got this right on my test :-)
Using a molecular<span>, scientists are able to estimate the amount of time that two species have been evolving independently.</span>lecular