DENDROLOGY

Detailed explanation-1: -Secondary succession is more common and usually occurs faster than primary succession because the substrate is already present. Secondary succession occurs on a surface where an ecosystem has previously existed.

Detailed explanation-2: -Secondary Succession is faster than primary succession because secondary succession starts with a complete layer of soil, while primary succession has no soil.

Detailed explanation-3: -Primary succession is a slower process than secondary succession. Because, life has to start from a zero, whereas secondary starts at a place that had already supported life before.