A population of zebras experienced ten births, six deaths to predation, three deaths to disease, three individuals joining the population, and zero individuals leaving. What is happening to the population growth?

Population change equals births plus individuals joining, minus deaths and individuals leaving. Here, 10 births + 3 joining − 6 predation deaths − 3 disease deaths − 0 leaving = 4, so the population grows by four zebras. The population is increasing, choice D.

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