The graph below shows population growth for paramecia kept under laboratory conditions for 18 days. 120+ S 80+ 40- 4. 6. 10 12 14 16 18 Time (days) Which one of the following statements explains what is happening in the region of the curved labeled "X"? Othe population's birthrate equals the death rate Othe paramecia have used up their food supply Othe paramecia are in water that is too warm the population's birthrate is zero Population Size

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