Question

which organism is most closely related to the bird? turtle crocodile lizard snake

Explanation:

To determine the organism most closely related to the bird, we analyze the phylogenetic tree (evolutionary tree) shown. In evolutionary biology, organisms with a more recent common ancestor are more closely related. Crocodiles and birds share a more recent common ancestor (they are both archosaurs and part of the group including dinosaurs, with birds evolving from dinosaur - like ancestors, and crocodiles being their closest living relatives among the options here). Turtles, lizards, and snakes are more distantly related to birds compared to crocodiles.

Answer:

crocodile