What are some features of birds that reflect how they may have evolved from dinosaurs

Some features might be feathers, thin bones, they are lighter to make flying easier.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.