Which layer of the wall of the alimentary canal contracts to move materials through the canal? 

Although oxygen may be introduced to the fire area, increasing the smoke generated, most _______________are aimed at protecting the occupants

a. fire alarm systems b. smoke detection systems c. smoke control systems d. sprinkler systems

An example of a long bone is:

A) one of the small bones in the wrist. B) the patella (knee cap). C) the rib. D) the femur (thigh bone).