What structural feature of compact bone prevents it from bending when forces are applied to either end?

Osteons are the structural feature of compact bone.

Explanation:

Osteons are the cylindrical structure that contains a mineral matrix and living osteocytes connected by canaliculi, which transports blood. Each osteon consist of lamellae, which are layer of compact matrix that in the same direction and it helps the bone resist bending or fracturing.

Between the rings of matrix the bone cells osteocystes are located in the space, called lacunae. Each osteon has many little spaces between its rings.

Compact bone is composed of osteons and harversion systems. It is the main structure in the body for support, protection, and movement. It has a strong nature.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands