ID structure (flat area) within this region

How should this image be labeled?  

Select the False statement

A chemist carries out this reaction in the laboratory, using 4.31 grams of zinc and an excess of sulfur: Zn + S 

How can this image be improved?

ID structure (thin white line)

Which uterine layer is being measured in the image below?  

ID structure (blue/purple depression ONLY) note:  it is not an entire layer itself. It is part of a layer

Determine the mass of nitrogen that can be formed from the reaction between [a] g N2O4 and [a] g N2H4.  Some possibly useful molar masses are as follows:  N2O4 = 92.02 g/mol, N2H4 = 32.05 g/mol. N2O4(l) + 2 N2H4(l)  →  3 N2(g) + 4 H2O(g)

ID structure (yellow line) note:  this is a medial view of the hip and femoral region