[" Pouched mammals of australia survived "],[" due to :- "],[" (1) Mutation "],[" (2) Gene migration "],[" (3) Continental drift "],[" (4) Reason is not clearly known "]

A: During evolution pouched mammals of Australia survived. R: Due to lack of competition from any other mammal due to continental drift.

Match column I with column II and select the correct option from the codes given below. {:("Column I","Column II"),("Mutation",(i)"Changes in population's frequencies due to chance alone"),("Gene flow",(ii)"Differences in survival and reproduction among variant individuals"),("Natural selection",(iii)"Immigration, emigration change allele frequencies"),("Genetic drift",(iv)"Source of new alleles"):}