1 Using evidence from the Sea Star Wasting Disease case study, explain how change in allele frequency over time (evolution) happens due to: (Pick one or two of the following to explain) 1) Species increasing in number 2) Mutation and sexual reproduction results in a variety of genes passed on and carried by individuals of a population 3) Organisms in a community compete for resources 4) Organisms who can survive, thrive and reproduce will increase in number.