Which statement is true about the forces involved in an ornithopter and a pterosaur taking off

The flapping of wings create forces which are caused by usage of two muscles pectoralis and supracoracoideus.

Explanation:

An ornithoper is a bird which fly by the movement of its wings. These creature fly by using their muscles. They may differ in flying method from one another but their way of flapping and flying is same. Pterosaur are the close cousins of dinosaurs who used to flap their wing to fly. They are not birds instead they are a form of reptiles who fly.

answer: wheres the options

explanation:

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]