Answer:
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I think 1,2,and,4 are true
Answer:
All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in. Unlike prokaryotes, eukaryotic cells also possess internal membranes that encase their organelles and control the exchange of essential cell components.
Answer:
"heart attacks are most often caused by a sudden drop in blood pressure."