The two species that are most closely related in the options you provided are the stick insect and the goldfish, as they are both classified under the animal kingdom (kingdom: Animalia). The kingsnake belongs to the reptile class (class: Reptilia), the dog belongs to the mammal class (class: Mammalia), and the goldfish and stick insect both belong to the fish class (class: Actinopterygii) and insect class (class: Insecta), respectively.
