Occlusal fossa of the primary crown is
Since the thickness of the covering of pulp(enamel and dentin) is less in primary crown, then fossa will be shallower.
PULP
(PULP CHAMBER ANATOMY IN BOTH PRIMARY AND PERMANENT TEETH CLOSELY APPROXIMATES THE SURFACE SHAPE OF THE CROWN)
shallower than the permanent
deeper than the permanent
same as permanent
can be 1 or 2.