Which event in the typical life cycle of sexually reproducing fungi involves transition from a haploid to a diploid stage?

Karyogamy should be that

Three reasons of the deaths of native americans: new illnesses that their immune systems couldn't cope with. genocides so the settlers could have the good land.starvation from lack of rations and poor infertile land on resevations

Idon't know how to do this but maybe ask your mom or dad