The only variables in the lab procedure are the independent variable, and thedependent variable,

a = executive branch; b = judicial branch

during expiration the diaphragm relaxes, which causes the diaphragm to move downwards. the contraction of diaphragm increases the space for expansion of lungs. hence, the diaphragm relaxes and positioned downward during expiration.

the combining form means bone marrow or spinal cord. meio- "meiosis" myco- "mycosis" myelo- "osteomyelitis or myelogram" myo- "myositis";

the answer is: myelo- "osteomyelitis or myelogram"