You are a paleontologist and you have a very complete fossil

Last updated: 4/24/2023

You are a paleontologist and you have a very complete fossil record for some birds When examining your fossils and considering them in a timeline you notice that the species Yorkus campicus seems to disappear gradually from the fossil record but it is replaced by Yorkus studenti These two species are clearly distinct but show remarkable similarity and some of the fossils in the middle of your timeline almost seem like transitional forms They must be very closely related You conclude that this is likely case of a Anagenesis b Cladogenesis c Mutation d Assortative mating Prezygotic isolation e