There are two main schools of thought in modern biological theories as to why senescence happens: Error versus Programming.

关于为什么会发生衰老，现代生物学理论中有两种主要的思想流派：错误与编程。

In this video, you have learned the importance of observation in the development of one of the most famous biological theories of all time.

在这段视频中，你已经了解了观察在有史以来最著名的生物学理论之一的发展过程中的重要性。