During one year a population of blue jays has zero population growth. Which must be true about the blue jay population at the end of the year compared to the beginning of the year?

Zero population growth means the total number of blue jays did not change over the year, so the population has the same number of individuals at the end as at the beginning. It does not mean they are all the same individual birds; some may have died or left while others were born or arrived. Therefore, “It will have the same number of individuals in it” is correct.

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