Prokaryotic cells lack a defined nucleus, but have a region in the cell, termed the nucleoid, in which a single chromosomal, circular, double-stranded DNA molecule is located.
 
        
             
        
        
        
Answer:
Through anaerobic biochemical rraction
Explanation:
Just my best
 
        
             
        
        
        
In an endothermic reaction, energy is absorbed which causes the object to heat up. 
        
             
        
        
        
Answer:
No viruses are not considered as living organisms, until they enter the body of the host