Listening Part 3: Select missing word

PTE Listening Part 3- Sample 9: Select Missing Word

How quickly is the world’s population growing? In the United States and other developed countries, the current growth rate is very low. In most developing countries, the human population is growing at a rate of 3 people per second. Because of this bustling growth rate, the human population is well on its way to reaching 9 billion within a lifetime.