________ is a muscular partition that helps in breathing by contracting and flattening, thereby increasing the volume of thoracic cavity.

________ is a muscular partition that helps in breathing by contractin

1.	________ is a muscular partition that helps in breathing by contracting and flattening, thereby increasing the volume of thoracic cavity.
Answer» ________ is a muscular partition that helps in breathing by contracting and flattening, thereby increasing the volume of thoracic cavity.