Answer:
Secondary Succession is when an ecosystem dies then comes back after x time. While people expanding and growing across the planet, ecosystems are getting smaller and smaller. Grass growing through the cracks of a sidewalk is Secondary Succession. Secondary Succession takes a shorter time than Primary Succession, Primary Succession takes thousands of years while Secondary Succession takes a few hundred years.
Explanation:
An area going through secondary succession reaches its climax community faster because the area begins with some soil and some plant and animal species. An area that goes through primary succession, on the other hand, begins with no soil and no organisms, so reaching the climax community takes longer.
