Why does secondary succession occur faster than primary succession?

Because soil is already present.

Explanation:

primary succession if I remember this right is when there is no soil and Moss breaks down rocks into soil which can take lots of years or something similar to that but secondary succession is when soil is already present so therefore it occurs faster than primary succession

bc blah

explanation:

bc blah

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands