I would say the last one. Yes, the coral reef in the south is being threaten but, it’s not the only one. Many other reefs are being threatened. Why? To find the problem to this reef you need to find the problems of other reefs and compare the data. Which ever the most problem cause you get rid of that first.
Answer:
STEM CELLS
They serve as a repair system for the body.
The best and most correct answer among the choices provided by your question is the first choice or letter A.
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An advantage of electron microscopes compared to light microscopes is that electron microscopes allow you to view living cells, while light microscopes do not.</span>
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