Describe how the successional stages would differ from primary succession

Primary succession is when things that grow on rocks and don't need soil, like lichen, break down the rocks and turn them into soil.  Then things that grow on soil can grow, like algae and fungus and firther break down the soil.

The successional stages would be larger organisms like plants and animals.  

Amutation is basically the change in the gene, caused by alteration of single based units in the dna, or the genes or chromosomes were rearranged in the dna