What lines the holes of spongy bones? 

When lifting a heavy object, which of the following statements describes poor body mechanics

a. Hold the weight of the object as close to your COG as possible. b. Bend the knees and keep the spine straight as you lift. c. To engage powerful trunk muscles, pull up with shoulders as you lift. d. To engage powerful hip muscles, push your feet down as you come up.

In what age range can most children begin to use and understand full sentences?

A) 2 to 3 years B) 3 to 4 years C) 4 to 5 years D) 5 to 6 years