在讲座中，教授主要讨论了可以导致人口变化的两种不同类型的因素。教授提供

In the lecture, Professor discusses the two different types of factors that can lead to demographic change. Professor provides two examples to explain biotic and abiotic factors in his speech. The first factor is called bio-like predator - prey cycle. For example, the rat population varies with the number of owls, owl because the mouse as prey. If the owl in the year than usual, then the rat population will be reduced. Because there are more owls can eat rats. The second is called the non-living, just like the weather. For example, adult rabbits usually starts at the end of winter. They have been breeding the next winter. However, if this is a short winter, so the rabbit can start breeding earlier than the longer winter. This means that the rabbit will experience at least one additional reproductive cycle, the number of rabbits will increase. This is the two factors speakers presented in this presentation.

In the lecture, the professor mainly discusses two different types of factors that can lead to demographic change. The professor provided two examples to explain the biological and non-biological factors in his presentation. The first factor is called a creature, like a predator-prey cycle. For example, the number of mice varies with the number of owls, who use them as prey. If there were more owls than usual in a year, the number of mice would decrease. Because there are more owls that can eat mice. The second is called abiotic, just like the weather. For example, rabbits usually begin to reach adulthood at the end of winter. They breed until next winter. But if this year is a short winter, rabbits can start breeding earlier than longer winters. This means that rabbits will experience at least one additional reproductive cycle, so the number of rabbits will increase. These are two of the factors that the speaker raised in this speech.

In the lecture, the professor mainly discussed two different types of factors that can lead to population change. The professor provided two examples to explain the biological and abiotic factors in his speech. The first factor is called biology, like the predator prey cycle. For example, the number of mice varies with the number of owls, which use mice as prey. If there are more owls than usual in a year, the number of mice will decrease. Because there are more owls to eat mice. The second is called abiotic, just like the weather. For example, rabbits usually begin to grow up at the end of winter. They breed until the next winter. However, if this year is a short winter, rabbits can start breeding earlier than the longer winter. This means that rabbits will experience at least one additional reproductive cycle, so the number of rabbits will increase. These are the two factors that the speaker put forward in this speech.<br>