Asheet of skeletal muscle extends across the ribcage and lies at the base of the thorax. it separates the thoracic cavity from the abdominal cavity. this muscle is the

This muscle is the "Diaphragm".

Sheet of interior skeletal muscle that reaches out over the base of the rib cage. It isolates the thoracic cavity which contain heart, lungs and ribs, from the abdominal cavity.

This also plays out an imperative role in breathing: as it contracts, the volume of the thoracic cavity boosts and air is drawn into the lungs

This metaphor uses symbolism when describing the “arch” of ulysses life. he is trapped in a time of life where adventure is moving as he tries to proceed to it. he will never reach it and will learn to accept it. ulysses symbolizes that arch in life, that no one can reach every goal, or every sight in life. even though this personality of curiosity and purposefulness exist in all mankind, the purpose of showing his strive to succeed symbolizes great leaders today. his curiosity represents the curiosity of humans that everyone desires to find answers and wont give up without a fight. ulysses is a symbol of the human race.

Ibelieve it is d but i may be wrong