AP BIOLOGY

Detailed explanation-1: -Birds have bones which are light and hollow; the bones of birds lack high density, they possess low density as it would help them to fly. To attain a stress-free smooth flying bird, have lighter bones. Their sternum is denser than other bones. Feathers do not have any bones.

Detailed explanation-2: -In biology, Aves is a taxonomic class belonging to the phylum Chordata and subphylum Vertebrata. They are characterized by having the following features: wings and feathers. laying eggs with a hard shell.

Detailed explanation-3: -A bird’s main limb bones are hollow, with special struts inside to strengthen them. This makes them stronger than a mammal’s without being heavier. Other bones are more rigid than in a mammal’s skeleton.

Detailed explanation-4: -They are called pneumatic bones (pro-nounced New-Matic) and include the skull, humerus, clavicle, keel (sternum), pelvic girdle, and the lumbar and sacral vertebrate. Another important type of bone in the avian skeleton is medullary bones. These include the tibia, femur, pubic bone, ribs, ulna, toes and scapula.

Detailed explanation-5: -Despite regional variation in bone density, bird bones are, on average, denser than the bones of similarly sized mammals, and are therefore probably stiffer and stronger relative to their weight.