What is the percent by mass of nitrogen in NH4NO3?

A compound contains 2.40 g Mg and 1.60 g O. What is the empirical formula?

Name this structure, (in the adult heart) that is a physical hole in the fetal heart to allow blood to flow from the right atrium to the left atrium, by passing the lungs        

Labeled the highlighted landmark (structure).

Name this landmark (structure) of the vertebra.

Name this highlighted bone in the knee joint.

Name the cell structure labeled B.

The Reticular Activating System (RAS) is primarily responsible for speech production.

Name this region of the long bone.

The utricle and saccule detect linear acceleration and head position.