Here's a breakdown:

* Different types of organisms: This refers to different species, genera, families, etc., that have existed throughout Earth's history.

* Appear and disappear: This refers to the fact that fossils of certain organisms are found in specific layers of rock, indicating their existence during that geological period. The absence of fossils in later layers suggests their extinction.

* Specific, predictable order: This is the key point – the order in which these organisms appear and disappear is consistent across different locations. This allows geologists and paleontologists to use fossils to determine the relative age of rocks and sediments.

In simpler terms, the principle of fossil succession says that fossils are like a time capsule that can tell us about the history of life on Earth. It allows us to reconstruct the past by understanding which types of organisms lived at different points in time.