The two differences you see when comparing the four chambers of the heart is that the arteries have a thicker wall and veins have thin walls and that the arteries carry oxygenated blood away from the heart which means they get more pressure than veins.
Answer:
antibiotic resistant is a consequence of evolution via natural selection. the antibiotic action is an environmental pressure;those bacteria which have a mutation allowing them to survive will live on to reproduce
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I’m pretty sure it is Synchondrosis
