Answer:
b. a single temporal fenestra
Explanation:
Synapsids have a temporary fossa in the lower part of the temporal bone. These reptiles mamiferoides only have a single inferior temporal fenestra.
The synapsids were the first amniots to diversify and appeared  in the middle of the Carboniferous. These first synapses were characterized by the presence of a single temporary fenestra behind each orbit, through which the mandibular muscles pass.
 
        
             
        
        
        
The picture below represents; A. Gas
 
        
                    
             
        
        
        
Land ownership is the answer for Apex
        
                    
             
        
        
        
C:  The polar bear will probably not survive.