A classification system is a system with a distribution of classes created according to common relations.
...........The answer is A
1.) a mature mushroom drops spores
2.)spores falls on the ground - germinate
3.)they meet compatible spores
4.)mycelium originates - pinheads originate
5.)primordially formation -growth mushrooms drops spore
6.)circles completed
B. Clade 1 is ancestral to all the other clades
