how can you summarize this paragraph?

Question

A primary succession occurs when the change in species composition than in a previous uninhabited environment. This means no soil exists when the primary succession starts. An example of a primary succession is recently formed lava from a volcano or bare rock surfaces. Therefore, in the ecosystem animation it, is a secondary succession. I say this because a secondary succession happens after a disturbance of some sort. An example of a secondary succession would be an abandoned farmland, a forest fire, or even a place that has human activity.

Answer 1

One or more words seem to be omitted from the first sentence.

When primary succession starts, there is no soil, only bare rock. Secondary succession begins after a some kind of disturbance occurs in this environment.