i think
shark
The wings.
Feathers are a structure that are common to all species of bird. Most feathers are very similar in structure, although they vary depending on how and where the bird lives.
A forelimb is an anterior (front-most) limb (arm, leg, or similar appendage) on an animals's body.
There are many organism with a forelimb with the most primitive trait. These animals include certain species of monkey animals.
Cell with similar structure and functions are grouped into tissues.
Oxytocin is very similar to vasopressin.
capillaries
Any bird is technically a dinosaur and Terror birds were the most similar to the actual beast of the Mesazoic. The body and stance of all species of terror bird were extremely similar to the body structure of therapod dinosaurs. Terror Birds were also very fast runners just like modern Ostriches and just like their Dromaeosaur ancestors.
the walls of lymphatic vessels are similar to those of veins
a cell wall
Uranus